Getting this quite often and intermitently on most https sites. Win 7 x64 Firefox 37.0.1 Adguard 5.10 Firefox Extension 2.05 I have installed and res-installed the Firefox Certificate, which didn't change or help anything. Deleted all the files from C:\ProgramData\Adguard\NetworkTemp\SSL except for the adguard CA.cer and adguard CA.pvk Tried the newer network driver. Only Filters in use are adguard assistant, adguard popup blocker, and WOT Right now the program is unusable unless a disable https scanning or just disable it completely. Error Msg in Firefox when trying to connect to https://kb.adguard.com/index.php? Anyone care to help?