Chrome Doesn't Trust Fiddler Root Certificate

Question

I have Fiddler installed on my machine. I have installed the Fiddler Root Certificate to decrypt HTTPS traffic, but it only works in FF and IE, not in chrome. Chrome does no

Answer 1

I was having the same issue with chrome / fiddler on ubuntu 20.04 not trusting the root certificate. I used the below steps to install fiddler - its a beta 'fiddler everywhere' which seems like its missing a few things that were there in windows version but it does work. Im not sure if this depends on (sudo apt install mono-complete). I tried the full version which did require mono so I definitely have that on my system but think mono is broken. Thinking that fiddler everywhere is somehow self contained.

• download https://www.telerik.com/fiddler-everywhere/insiders

• chmod a+x fiddler-everywhere-insiders.AppImage

• ./fiddler-everywhere-insiders.AppImage

I exported the certificate from fiddler options/https as crt (extensions for certs are confusing but I think this really is an x509 ssl certificate). To import to chrome I searched settings for 'manage certificates'. There are a bunch of tabs in that section and you have to select the authorities tab. I literally wasted an hour or more because I didn't see the tabs and was trying to import via the default 'your certificates' tab. Once I imported in the right place I was able to browse https traffic and fiddler everywhere could decrypt it.