When I try to trusst the fiddler root certifficate, I get the message "not successfull" and see a line like this in the logfile:
[2021-03-01 16:29:48:866] [Information] [Fiddler] Error when trying to check if certificate is trusted: '.', hexadecimal value 0x00, is an invalid character. Line 304, position 38.
I also tried to trust the certificate by hand via the keyring utility.
What can I try?