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After entering the password to connect to their secure wireless network, several users have reported the Possible network security key mismatch error.
This error is more common among the Windows 7 users. The cause of the error appears to be wrong security mode, third-party antivirus tools, and as well as issues with the wireless drivers.
If you are also troubled by this error, here are a couple of troubleshooting tips to help you resolve the possible network security key mismatch error in Windows.How do I fix Possible network security key mismatch error? 1. Check your antivirus
Third-party antivirus is known to interfere with the wireless network resulting in the possible network security key mismatch error.
If you have a third-party antivirus installed, try disabling it temporarily.
You can disable the antivirus temporarily from the taskbar.
Some antivirus software allows you to disable protection for 10 or 15 minutes as well.
Once the antivirus is disabled, try connecting to the wireless network again and check for any improvements.
If the issue resolves when the antivirus is disabled and tends to appear when enabled, try changing the antivirus.
Press the Windows key and type control.
Select the antivirus from the list of installed apps and select Uninstall.
Once uninstalled, download and install other antivirus solutions such as Malwarebytes.2. Change the wireless network security type
Press Windows Key + R to open Run.
Locate the problematic network and check the security type displayed in the info bar.
Choose Manually create a network profile option from the next window.
Under Enter information for the wireless network, you want to add, enter the Network name.
For Security type try changing from the one you noted in the previous steps.
Enter the security key.
Check the Start this connection automatically box.
Check if you can connect to the network without any issues.3. Reinstall wireless drivers
Press Windows Key + R to open Run.
In the Device Manager window, expand Network Adapters.
Select Scan for hardware changes option.
Windows will scan for missing wireless drivers and install the compatible driver automatically.4. Change your router’s security type
Login to your router admin center using the IP address. You can find more details in the router’s instruction manual.
Change the Security Mode to something other than what is already selected.
Sign out of the router admin center and check for any improvements.5. Release and renew IP address
Press Windows key + R to open Run.
Close the command prompt.
Try connecting to your wireless network and check for any improvements.
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Twitch is a very popular online game streaming website owned by Amazon itself. Many users watch live video game streaming on Twitch. Since its release, the users of Twitch are continuously facing a major issue where the entire window remains black and the user becomes unable to use it properly on the Twitch app or even in Chrome browser. Whenever they try to open Twitch on the Chrome browser, the screen gets black.
A few workable solutions are discussed below in detail to help you to resolve the Twitch black screen problem. All the fixes are provided below. All you need to do is to follow them accordingly and apply one by one as they are listed below to know which one fixes your problem.
Browser issue: If your browser has bad cache or the browsing data is corrupted, you might have the black screen issue.
Error in DNS settings: It is possible that your DNS settings are set to a wrong configuration or might not be working properly that is causing you to experience the black screen.
Server issue: The black screen issue might appear due to technical issues from the server. In that case, you may be incapable to resolve it.
IP settings: If your IP setting has no proper configuration, you might have network issues.
Hardware problem: Hardware accelerations may cause issues with Twitch although it improves the performance. Users reported that many clashes with websites and applications occur due to hardware acceleration.
It is necessary to use an active open internet connection instead of using a VPN, and ensure that there are no firewalls installed on your computer. You also need to log in as an administrator on your computer before applying the solutions.
It is time to start with the solutions. There are some troubleshooting steps listed below. You should start with the basic troubleshooting after a restart of your computer. All the possible solutions to the black screen are discussed here. You need to apply them one by one.
Sometimes clearing browser data removes all browser-related issues and fixes the Twitch black screen in Chrome easily. Below the steps are provided how you can clear the browsing data:
It will open more settings and locate the Privacy and Security section.
Go to the Advanced tab and select the time range as All times.
Check all the boxes except the Password and Autofill form data option.
Now relaunch the Twitch on chrome and check if the error still continues.
Now select the Settings option from the menu.
After applying these settings, restart the browser and relaunch Twitch to check if the problem is resolved.
Disabling hardware acceleration on Google Chrome settings fixes the Twitch black screen in chrome during video play. To make the hardware acceleration settings disabled, follow the steps below:
Go to the Google Chrome settings by following the steps as stated above.
Again, scroll down and locate the Use hardware acceleration when available option in the System section.
Now relaunch the Google Chrome browser.
Now open Twitch to ensure that the black screen appears or not.
If the Twitch black screen is not resolved yet, you should check all the installed plugins and extensions of your browser. You should disable all third-party extensions and plugins such as firewalls, antivirus or ad-block tools in your browser.
If the problem is fixed after doing this, you can enable the plugins one by one that will make you aware of the specific extension responsible for the black screen on Twitch while streaming. Block the plugins by following the provided steps:
Open the Chrome browser and go to the three-dot icon on the top right corner.
You can see all the installed Plugins and extensions listed here.
After disabling all the extensions and third-party plugins, relaunch the Chrome browser and open Twitch to find if the problem is resolved.
Some of the Users reported that enabling incognito mode helped them to resolve the black screen issue. You can enable the incognito mode by following the steps below:
A new Incognito window will appear, and you can see the notification stated, ‘You’ve gone incognito’.
Open the Twitch and play the stream in this mode to check whether the Twitch black screen in chrome still appears.
When there is a misconfiguration in your IP settings, the black screen might appear. To avoid the error, you need to request a new IP from the host and replace the previous IP. To do so, follow these steps below:
Press the Win + R key from the keyboard. The Run window will appear on the screen.
Type ipconfig /release and hit the Enter button on your Keyboard.
Again, type ipconfig /renew and press Enter.
After the prompt returns, type exit and press the Enter button to exit the window.
Once you have done this, your IP is replaced with the new IP and well-configured. Now try to open the Twitch and check if the error still persists.
With the access of the Administrator, you can change the DNS to Google DNS. It might help you to get rid of the black screen of the Twitch. All you need to do is to follow the steps below and apply them accordingly.
Select the Network and Sharing option in the window appeared.
On the next window, locate the “Internet Protocol Version 6 (TCP/IPv6)” and “Internet Protocol Version 4 (TCP/IPv4)” from the list of network properties.
Now activate the option “Use the following DNS server addresses”.
In the Preferred DNS server text box, put the value 2001:4860:4860:0000:0000:0000:0000:8888
In the Alternate DNS server text box, put the value 2001:4860:4860:0000:0000:0000:0000:8844
Activate the “Use the following DNS server addresses” option as stated above.
In the Preferred DNS server box, type 220.127.116.11
In the Alternate DNS server box, type 18.104.22.168
Now check if the black screen appears again while using Twitch on Chrome. It should be fixed already.
Twitch will suffer streaming in the browser if the TLS of your browser is not enabled. You need to enable the TLS by following the below-provided steps to fix the Twitch stream black screen issue.
To enable the TLS, press the Win + S key and type Internet Options in the search box.
It will open the Internet properties window. Navigate to the right and select the Advanced tab.
Scroll down until you find the TLS option.
Now check If this process worked for you to resolve the Twitch black screen issue.
Sometimes updating the browser resolves the black screen issue of Twitch. Although Google Chrome updates install automatically in the background, you can try to update the browser manually by going to the “About Google Chrome” page.
Select the About Google Chrome option from the drop-down menu. Another window will open.
If there is any pending update, it will notify you on the top of the Settings window.
Close and relaunch the Google Chrome browser.
Now try to open the Twitch stream to check if the Twitch black screen appears again.
If the above solutions didn’t work for you, you should try resetting the Google Chrome to the default settings. To do so, follow the steps below:
Scroll down to expand the Advanced tab.
Confirm the Resetting process.
After the reset process completes, close and relaunch the browser and open Twitch to check if the Twitch black screen is resolved.
You should reinstall your Chrome browser if any of the above-said solutions didn’t work for you. Uninstall the browser from your computer and download the latest version of Google Chrome from the Chrome official website. If you need assistance, follow the steps provided below:
Go to Programs option in the Control Panel app.
Now select Uninstall a program option.
All the installed programs will appear in the form of a list.
Put a check on the option “Also delete your browsing data box”.
When the installation is finished, run the Chrome browser.
A fresh installation might have resolved your problem with the Twitch stream black screen. Run the Twitch on your browser to check.
Using a proxy server is a very good choice to fix the black video screen issue. But sometimes you might get a black screen while streaming due to server problems on the proxy server you are using. So, you should avoid using VPN or proxy servers while streaming on Twitch.
If you are in need of a VPN, here is a list of best free VPN (2024 edition) that will help you to find the one that best suits you.
After applying all the solutions, if you notice that the problem still appears, you might try the MultiTwitch to watch streaming. All you need to do is to copy the broadcaster name from the Twitch and paste it after multiTwitch.tv.
An example is provided below to make it clear.
In case the broadcast name on Twitch is tv/abxy.
Here, “abxy” is the name of the broadcaster. Copy only the abxy part.
Now open a new tab on your browser and type chúng tôi
Paste the broadcaster name you copied previously after the / (slash) of the URL and press the enter key. Finally, it would look like chúng tôi
Enjoy the broadcast now.
I hope the Twitch tv black screen is not a matter of your worry now. Continue enjoying your favorite broadcast on alternative MultiTwitch.
CAS Team Finds Flaw in Computers’ Timekeeping Tens of millions of computers were vulnerable to attack
Tens of millions of computers were vulnerable to sabotage of their clocks, BU researcher Sharon Goldberg has discovered. Photo by Cydney Scott
Sharon Goldberg frets about internet security so the rest of us don’t have to. In a paper released yesterday, Goldberg and her team reported the kind of security problem worth worrying about, one that could be used by a bad guy to cripple the clock function of tens of millions of computers on the internet using a single attacking machine.
Happily, says Goldberg, a College of Arts & Sciences associate professor of computer science, fixes for the vulnerability were implemented before the paper was published.
Working with students Aanchal Malhotra (GRS’19), Isaac Cohen (CAS’16), and Erik Brakke (CAS’16) last spring, Goldberg discovered a potential vulnerability in the Network Time Protocol (NTP), the software and rules that synchronize clocks on computers. The team developed attacks that could alter the time on computer systems, compromising other applications, such as the encryption schemes that protect internet communications to bank websites. Other apps, from bitcoin systems to website authentication and login protocols, also could be breached.
“If NTP breaks, many other computing applications break as well,” says Goldberg, who holds a fellowship from the Rafik B. Hariri Institute for Computing and Computational Science & Engineering and is also a Sloan Fellow.
Before posting the paper on her project’s website, Goldberg’s team worked with the Network Time Foundation, which implements the NTP, and with software firms like Cisco Systems and Red Hat, to plug the holes in the NTP code. Goldberg says most computer users need not take corrective action, because their NTP software is routinely revised “via updates or patches to their operating systems.” She says operating systems “will be issuing patches that protect against our attacks, and other members of the Network Time Foundation are likely to do so as well.”
Experts needing to test their servers can consult the Goldberg team’s website for instructions.
“It is very likely that your laptop uses NTP to synchronize its clock to a time server somewhere out on the internet,” says Goldberg. “The encryption protocols that protect the information sent from your web browser to your bank’s website, for example, depend strongly on the accuracy of your computer clocks.”
The Network Time Foundation “really appreciates the work of Sharon, Aanchal, and their team in finding these issues and reporting them responsibly,” says NTF founder and president Harlan Stenn. “NTF has very limited resources, so the work of BU and other research teams is helpful in finding issues.”
The most serious potential attack found by Goldberg’s team involves the “kiss-o’-death packet,” a message that would prevent a computer system from communicating with its time server, possibly for years, essentially turning off NTP on the victim system.
Last week, Goldberg received a $250,000 grant from the Silicon Valley Community Foundation to continue research on the security of the NTP. She and her team applied for the grant last March, when they began to enable various computers in their lab “to speak NTP to each other,” she says, “and started running various experiments with the kiss-o’-death packet.”
“Timeshifting” attacks, in which a computer system’s time settings are altered, took longer to develop, she says, “because NTP is actually quite a complex protocol that has evolved over time.”
Goldberg says her team followed the standard “responsible disclosure” guidelines for researchers who uncover software vulnerabilities. That means alerting affected parties to the vulnerability and giving them a prescribed time to patch the problem, after which the researcher publicizes her work. Goldberg sent Cisco an early draft of her team’s paper in August—she regularly briefs that firm on her research, she says, because it has funded her work and has hired several of her students—and the company was “instrumental in helping us coordinate the responsible disclosure of our research results.”
Goldberg’s work helps cement “BU’s presence in cybersecurity,” says Azer Bestavros, a CAS computer science professor and director of the Hariri Institute. “Sharon’s work often involves undergraduate students, and they get inspired by taking her courses, underscoring how excellence in research contributes significantly to the quality of teaching and experiential learning.”
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Employees using instant messaging could be opening up gaping holes in
their companies’ network security.
Viruses aimed directly at instant messaging (IM) software, along with a
lack of security for IM freeware, are creating big problems, according
to Eric Chien, chief researcher for Symantec Security Response.
And to make matters worse, many, if not most, IT administrators don’t
have policies regarding instant messaging, and many don’t even know how
many end users have it installed on their desktops and laptops. That
means there are potential problems and security lapses that
administrators aren’t even aware of.
”At conferences, when we ask if people are using instant messaging,
everyone raises their hands,” says Chien. ”But when we ask who has a
policy about it, maybe 50 percent raise their hands… It’s a problem.”
Not so long ago, email surpassed the telephone as the key form of
communication in the workplace. People could send and receive emails
without interrupting their work flow. They could contact several
colleagues with one message. They could open a message and read it when
they had an opening instead of when the phone was ringing.
But today, instant messaging is nipping at the heels of email for the
top rung on the communication ladder. Messages can travel back and forth
in real time, enabling colleagues or business partners to communicate in
real time. Buddy lists enable coworkers to see when you’re online and
available. Away messages keep bothersome interruptions at bay.
All of that has made instant messaging popular. And that popularity has
made it dangerous.
”Instant messaging has become so popular that we’re getting the classic
issues that we’ve had with email,” says Chien. ”IM can attach and
transfer files, so viruses and worms can attach themselves. There are
worms that will send themselves to everyone on your buddy list.”
Actually, between 2002 and 2003 there was a 400 percent increase in IM
malware, according to Symantec’s figures. Since 2002, 25 instant
messaging worms have been released into the wild, with about 20 of them
coming out last year alone. At least five or six have hit the wild so
far this year, reports Chien.
”It’s a continuing threat,” says Steve Sundermeier, a vice president
for Medina, Ohio-based Central Command. ”Virus writers are always
looking for a new vector for infection… As companies secure their
email gateways, virus writers will be looking for alternative or
additional ways to get their viruses inside.”
However, with relatively so few viruses and worms targeting instant
messaging software, Chien and Sundermeier agree that the biggest
security threat comes through unencrypted messages traveling across
free, public software.
”What people should be the most worried about is that the IM traffic
with the popular free clients is unencrypted today,” says Chien. ”If
you use free messaging, people can sniff the traffic and read your
messages. It’s something hackers do all the time.”
Chien explains that if an employee is using IM to send a message to a
coworker down the hall or even in the next cubicle, the message travels
outside the building and through outside servers where it easily could
be picked up.
”Even if you’re talking to the guy in the cube next to you, your
message may go halfway around the world before it gets to the guy in the
cube next door,” says Chien. ”Sensitive business matters are exposed
to the general Internet for people to potentially sniff and view.”
Central Command’s Sundermeier says the best thing for IT administrators
to do is to create a corporate policy regarding IM usage. He suggests
that users not be allowed to use any freeware. The company should buy
instant messaging software designed for internal communications so
messages don’t needlessly travel across a remote server. They should
also make sure the IM software they’re using has encryption
Chien also recommends that IM shouldn’t be used for sensitive
information. And users should be reminded that they need to follow safe
computing practices when using instant messaging. That means they should
never open an executable and they should be careful around any
According to Microsoft’s official documentation, the bug check error APC INDEX MISMATCH indicates that there has been a mismatch in the asynchronous procedure calls (APC) state index. APC is a special function that executes asynchronously.
This means that a driver or system file has a mismatched sequence of calls to disable and re-enable APCs. Some common solutions to the issue could be a driver update or scanning the system files. However, there are multiple other reasons the PC might run into mismatched APC index errors.
This article explains a few causes that might result in the blue screen, along with possible solutions to fix the issue. So without further delay, let us get into it.
Corrupted system files
Error due to Windows Update
Before we begin, we will perform some troubleshooting steps. These methods will not fix the problem per se but will give you a detailed review of what may be causing the blue screen issue.
If your PC only boots into the Startup repair menu, you may need to boot into safe mode to perform some of the steps explained below. To boot into safe mode from the Startup Repair Menu.
The event viewer holds the record of everything that happens in a system. Using this special utility, we can determine the reason behind the BSOD. You can also check events right before the blue screen to know what caused the error.
To access and check the Event Viewer, follow the steps mentioned below.
Now, check the events near the BSOD to determine the exact cause of the issue. Another method to check the reason behind the BSOD is by from DUMP files. Dump files contain a snapshot of information related to specific crash.
DisplayLink application in your PC might be the reason you are getting APC INDEX MISMATCH BSOD error on your PC. A lot of DisplayLink users in different Q/A forum reported that uninstalling DisplayLink fixed the index mismatch blue screen.
If you are have DisplayLink installed in your PC, try removing it.
You can also try downloading and reinstalling the application from DisplayLink official website.
The PC will restart and start the diagnostic process.
Although overclocking a system provides a performance boost, it may even make your system unstable. This may result in the system to display a blue screen error. To disable any overclock done to a system, you can try resetting the BIOS. To reset a BIOS,
Most Windows discussion forums have also mentioned that users faced APC_INDEX_MISMATCH BSOD error when Realtek HD Audio Manager is enabled on Startup.
Windows have provided a driver update that fixed the issue. Updating Realtek HD Audio Manager driver may fix the BSOD error. Follow the steps mentioned below to update Realtek HD Audio Manager.
Go to Realtek HD Audio Manager official website.
Select the latest Realtek HD Audio Manager driver. The installation process should now begin.
Run the executable file as Administrator to install the Driver.
If the system starts and functions smoothly, you need to enable all the services one at a time to check the actual service that is causing the issue. Once you find the service, please remove it from the PC.
System files are responsible for running the entire Windows. It contains crucial OS and driver files that the system needs. If any of these files gets corrupted or damaged, the integrity of the entire OS may be at stake. This may also result in a random APC INDEX MISMATCH blue screen.
Try repairing the system files using the SFC.
After a Windows Update named KB5000802 on Windows 10, many users faced the APC_INDEX_MISMATCH blue screen. Windows triggered the bug every time users tried to print using Type 3 drivers. If this is the case for you, we recommend that you uninstall the KB5000802 Windows update.
A device drivers works as an interface between the OS and it device. It helps the OS communicate with the device. A corrupted or outdated driver may run into several issues. The device may even run into critical issues that may stop important system process, resulting in the BSOD.
Try updating driver to a latest version.
The BSOD troubleshooter scans and changes necessary settings in Windows to fix the blue screen error. However, BSOD troubleshooter utility is only available on Windows 10. But, the option is not available for Windows 11.
To run the BSOD troubleshooter,4
System Restore reverts all your computer setting to previous saved state. This saved state is called a restore point. The restore point is like a snap shot of all your computer settings. Now, once the user prompts a system restore, all the PC’s current settings will be back to its previous state.
Performing a System restore will not delete any files and folders. However, it will remove any application installed after a restore point.
However, before we start, you need a restore point set to before the blue screen started.
How to connect Messages to MacBook in 3 easy steps
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Download Fortect and install it on your PC.
Start the tool’s scanning process to look for corrupt files that are the source of your problem
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Many users reported that they can’t send or receive messages on their Mac. This can be a problem, but if your MacBook isn’t connecting to Messages, in today’s article we’ll show you how to fix that.What to do if I can’t connect Messages to MacBook? 1. Restart your Mac
Sometimes there might be a glitch with your system that makes you unable to send or receive messages. The quickest way to fix it is to restart your Mac like this:
Go to the Apple menu.
Once your MacBook restarts, check if the problem is still there.2. Check Messages settings
Sometimes if your Messages app isn’t configured properly, you won’t be able to send or receive messages on your Mac. To fix that, do the following:
Open Messages app.
Select Preferences in the app menu.
Go to the iMessage or Accounts
Make sure that your account is enabled and that all options are checked in You can be reached for messages at.
Some users are suggesting to disable Enable this account option in the Apple ID section and restart their Mac to fix the problem. After your MacBook restarts, repeat the steps from above, but be sure to check Enable this account option.3. Sign out of Messages
There might be a glitch with the Messages app and that can make you unable to send or receive messages on your Mac. To fix it, simply sign out of the Messages app and sing back in. To do that, follow these steps:
Open the Messages app and go to Preferences.
Now to go iMessage
Incorrect date and time can cause issues with the Messages app. To fix it, you just need to adjust the date and time like this:
Now choose Date & Time.
Navigate to Time Zone tab and check Set date and time automatically.
If this option is already enabled, uncheck it, and check it again.
After doing that, check if the problem is still there.
These are several quick and easy solutions that should help you if you can’t send or receive messages on your Mac.FAQ: Learn more about Messages on MacBook
Can I get text messages on my Mac?
How do you press enter without sending a message on Mac?
To enter a new line of text without sending the message on Mac, you will need to press the Options key and then hit the Enter button.
How do you go to the very first message on iMessage?
Inside the Messages app, select the message thread you want to explore and tap on the time stamp at the top of your display.
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