Firefox 64.0.2: SEC_ERROR_UNKNOWN_ISSUER

Discussion in 'Technical Support (AdGuard for Windows)' started by Kliko, Jan 21, 2019.

  1. Kliko

    Kliko New Member

    Joined:
    Jan 21, 2019
    Messages:
    2
    Hi all,

    I am having the "SEC_ERROR_UNKNOWN_ISSUER" error on every website in Firefox only.

    I tried everything I could to resolve this:
    - Removed the personal certificate from firefox, because it was already there and manually installed it again
    - Reinstall firefox, installed the personal certificate manually.
    - Tried a portable firefox, also installed the personal certificate manually there
    - Reinstalled Adguard

    Somehow, none of these things solve this issue but other browsers are working normal.

    The problem now even persists whenever I remove Adguard from my system totally and reboot.
    Basically, there is now way for me right now to use Firefox because of this, its a bit annoying.

    I am using the latest Firefox 64.0.2 64bit, on Windows 10.

    Anyone has any suggestions, please?
     
  2. TheHasagi

    TheHasagi Quality Assurance / Support Commando Staff Member Administrator Moderator

    Joined:
    Mar 26, 2018
    Messages:
    1,405
    @Kliko

    Hello!

    Seems like this is a certificate issue. Can you be so kind, try to install the latest Nightly build and reinstall certificate AdGuard - Settings - Network - Reinstall certificate.

    Also, when you are on the website what certificate displayed?
     
  3. Kliko

    Kliko New Member

    Joined:
    Jan 21, 2019
    Messages:
    2
    Hi, im sorry, but, I found out what the problem is.
    Somehow, Bitdefender has this effect with adguard all of a sudden.

    If i turn off Bitdefender totally, and only Adguard, it works, and vice versa. Its strange because it just started to do that yesterday and im now using it for a bit already.
    Not sure what to do to fix it tho :(
     
  4. TheHasagi

    TheHasagi Quality Assurance / Support Commando Staff Member Administrator Moderator

    Joined:
    Mar 26, 2018
    Messages:
    1,405
    @Kliko

    Well, try to switch between WFP/TDI driver (AdGuard - Settings - Network - Use WFP driver [on/off]) and check if it helps. Also, try to add AdGuard.exe and AdGuardSvc to the exception list of Bitdefender.
     
  5. Fr9Tcm

    Fr9Tcm New Member

    Joined:
    Feb 15, 2016
    Messages:
    35
    Try disabling bitdefender ssl scanning because not only it does not offer much but also uses tls 1.2.