sec_error_bad_signature fix: Family settings in Windows disable
A lot of users complain, after the Upgrade to Windows 10 via the error message. She's usually in connection with the Microsoft Family settings. To avoid the error, you need to change the restrictions through the Family settings.
- Log on to this Microsoft webpage with your Windows Account.
- Then select the Person you want to be the limitation for web pages to remove.
- You are now under the websites of the switch to "Block inappropriate websites" to "Off". Then the error in Firefox no longer appear.
- It is more difficult, if you want to let the Family settings enabled and the error still want to eliminate it. In this case, you must import the SSL certificates for the relevant pages to each unit individually.
- Microsoft provides for this case a detailed Tutorial on. You can find it under the section "Known issues for Firefox users".
Firefox-error fix
A further error source: Avast Antivirus with Firefox
Avast and other anti virus programs to offer more and more often a so-called "HTTPS Scanning". Here, actually, encrypted Connections to be scanned.
- However, this is successful only if the data is decrypted stream with the correct SSL certificate. This is so with other words, a "Man-in-the-Middle attack" in a good sense.
- However, this practice also triggers the error "sec_error_bad_signature" in Firefox. Therefore, do not open the interface of Avast and navigate to settings.
- Click on "Active Protection" > "Customize next to Web Shield".
- Now remove the check mark for "Enable HTTPS Scanning" and confirm with "OK". In the case of other anti-virus programs, the procedure is similar.
Filter in Avast to disable
We will also tell you how in Firefox, the error code "sec_error_unknown_issuer" how to fix.
