If you’re having some problem browsing multiple websites on the Firefox browser on your Windows 10 computer, then this post might be of help. One of the most common problems you could encounter in Firefox is mostly related to HTTPS and one of them is the MOZILLA PKIX ERROR MITM DETECTED or ERROR SELF SIGNED CERT or SEC ERROR UNKNOWN ISSUER error which means that Firefox was unable to trust certificates issued on secured websites.
If you encounter the MOZILLA_PKIX_ERROR_MITM_DETECTED error in Firefox, this indicates that something in your network or system is interrupting your connection and injecting certificates and when that happens, Firefox won’t trust it. In such cases, one of the culprits is malware. Malware will try to replace a legitimate certificate with its certificate. Another cause is security software where it keeps a tab on a secure connection and creates a false positive, for instance:
“In Microsoft Windows accounts protected by Family Safety settings, secure connections on popular websites like Google, Facebook and YouTube might be intercepted and their certificates replaced by a certificate issued by Microsoft in order to filter and record search activity.”
And if you are connected to a corporate network, there might be a monitoring/filtering product that could be replacing certificates. Moreover, there are also users who reported getting this issue when they use the Nightly version of Firefox. And if that’s the case, you have to try accessing secure websites using only the stable build especially when it comes to payments. However, if you are not doing that, then here are some options you need to check out.
Each security-based software has a security option that allows you to turn off the HTTPS scanning functionality. They may be available under different names such as HTTPS Scanning, Scan SSL, Show safe result, Do not scan encrypted connections, etc. Find what is applicable for your security or antivirus software and then try turning it off temporarily and see if it helps in fixing the MOZILLA_PKIX_ERROR_MITM_DETECTED error in Firefox.
The next thing you can do if the first option didn’t work is to disable security.enterprise_roots.enabled which is an HTTPS certificate check on Firefox. Note that this is not recommended but you have to at least try in order to fix the error.
Error code 0x8007007e occurs in Windows 8 or 8.1 when users attempt to, but fail to successfully use Windows Update. When this occurs, Windows 8 or 8.1 users will not be able to access updates or certain web pages. This error manifests itself via the following common symptoms:
Error code 0x8007007e is usually caused by a malfunction within your system. This malfunction may be due to several issues such as malware on your device, or the accidental removal of a registry entry or system file.
To correct issues related to error code 0x8007007e in Windows 8.1, users may need to employ one or several manual repair methods. Users will not necessarily need technical skills to accomplish this task. However, if you are uncertain of your skills or you are unable to resolve the issue after completing the tasks below, consult a Windows repair technician or use an automated tool.
System File Checker (SFC) enables users to check their system for corrupt or missing system files. You will need to use Command Prompt. To access System File Checker on Windows 8 or 8.1, follow the instructions below.
Whether you run Windows 8 or 8.1 operating system on your computer, System File Checker will begin to find and repair missing or corrupted system files. If, however, you are unable to successfully complete the task via Command Prompt, repeat the steps above. You may also consider help from a professional or simply move to the next manual repair method listed below.
If the Clean Boot is successful, you will be able to successfully update your system without receiving error code 0x8007007e. However, if the error code reappears while you attempt to access updates or web pages, proceed to the next manual repair method below.
Since error code 0x8007007e in Windows 8 or 8.1 can be caused by issues related to malware, it’s important for users to check their system using a powerful antivirus or anti-malware software. If you do not have one on your system, you will need to download such software as soon as possible.
Once you have the software on your PC, run a scan to check if your computer has been infected. If malware is indeed on your device, remove it using the anti-malware tool.
Another effective manual repair method relates to System Restore. This tool enables Windows users to restore their computer to an earlier period of time in which the error code was not present. When done properly, it can effectively resolve error code 0x8007007e. Before running this tool, however, be sure you select a time in which all important files and programs are present so as not to lose them.
DISM /online /get-features /format:table | more
DISM /online /enable-feature /featurename:[Enter the name of the feature here] –AllNote: Now if you want to disable a feature that’s already enabled in your computer, refer to these sub-steps:
Get-WindowsOptionalFeature -Online -FeatureName *Type feature name*
Enable-WindowsOptionalFeature -Online -FeatureName “Type feature name” –all
Disable-WindowsOptionalFeature -Online -FeatureName “Type feature name”
AmmyyAdmin is a software developed by Ammy. This software allows you to manage network computers and servers remotely without complicated NAT settings adjustments or Firewall problems. The program is similar in marketed function to TeamViewer or LogMeIn. This software does not require installation and it lets you control other computers or share files over the software. It usually comes bundled with other software. This software copes files into your computer and sometimes creates new startup keys that allow it to start each time your computer is restarted. AmmyAdmin might display additional ads in your browser as well as pop-up ads. Due to its ability to silently install and run remote administration, it could be used maliciously by those who intend to damage your computer or steal data. AmmyyAdmin is flagged for optional removal, and if you did not intentionally install it, removal is highly recommended
Error code 0x800ccc0f is an error that occurs when users attempt to send/receive emails in Outlook or Outlook Express. Though information regarding the error is limited and sometimes difficult to decipher to those unfamiliar with error code issues, the following are possible symptoms users can expect when this error occurs:
Errors in Outlook or Outlook Express may occur due to a multiplicity of reasons. It may be due to a problem with your network connection or the server. You may also encounter this problem after an extended period of inactivity.
Since the error could be due to one of many issues, several solutions are recommended. However, note that these suggestions require you to make changes that come with various risks. Be sure to implement these instructions correctly to avoid causing more problems to occur.
If you are not confident that you will be able to successfully implement the solutions below, get help from a certified Windows technician or IT professional.
As with other error codes, manual procedures are available which users can take to correct the problem. To implement manual repair, follow the methods suggested below:
Since error code 0x800ccc0f may manifest itself due to an issue with your network, you can seek to rectify the problem by first checking your connection. To do this, open an Internet browser. Type a valid web address in the address bar and click Enter.
If you are unable to access the website, you may then seek to fix the Internet connectivity issue by using Microsoft Automated Troubleshooting Services. These free tools are available for download on Microsoft’s website.
Not only can these tools fix your Windows Firewall – if this is the cause of your connectivity issues. These automated troubleshooting tools can also resolve other issues related to your Internet browser or network.
However, if after downloading and running these tools error code 0x800ccc0f still persists in Outlook or Outlook Express, implement the solution below.
Verifying your network connection is another way you can resolve your Outlook issues, i.e. once the issue is in fact a network-based problem.
To verify your network connection, make sure your computer’s network devices are turned on and fully functioning. Also ensure that the cables that connect your computer to a network are secure. You may also contact your Internet Service Provider (ISP) to verify your connection.
If there is no issue with your network and error code 0x800ccc0f persists, you will need to implement method three.
Problems with sending or receiving email messages based on the 0x800ccc0f error code could also be due to configuration issues for individuals who connect using a router. If this is a misconfiguration issue, you may be able to resolve the problem by bypassing the router and connecting through your modem.
Before doing this, however, be sure to check if your firewall is turned on as connecting directly can leave your machine vulnerable. Prevent attacks by checking your Windows Firewall setting. After making adjustments where necessary to ensure the firewall is turned on, test your connectivity to ensure you can access a connection. Also, check Outlook to see whether the error message has been resolved. If the error persists, consider the next solution.
Third-party apps like anti-virus software can sometimes cause interference, leading to errors. For this reason, check if the antivirus on your device is the source of the issue. Start by disabling the antivirus software. You may also turn off the software’s email scanning feature to verify whether or not that is the cause of the error.
Note that disabling your antivirus is only a temporary solution as it is not recommended that you use your computer without such protection in place. Consider replacing your antivirus or uninstalling and reinstalling for a permanent fix if indeed your issue with error code 0x800ccc0f was caused by interference from third-party apps.
Also, consider downloading a powerful automated tool to protect your machine from possible errors in the future.