This is similar to Safari can't connect to https, but is just for one single https site.
Safari can't connect to my local NAS' HTTPS site anymore because it "can't establish a secure connection". This is an administrator account, every other newly created account on the system works fine.
This happened after creating multiple different certs for my NAS with alternative names and installing a different one every few days during some testing. After the final certificate was installed to the NAS, I deleted all old certificates from the keychain. Now all alternative names mentioned in an older version result in the above problem, while the newly added alternative names working well:
- mynas.local doesn't work (primary cert name)
- old.mynas.local doesn't work (very first alternative name from early tests)
- new.mynas.local works fine (new alternative name from last cert generation)
Both work fine on other systems, or with a newly created user.
I tried the following without success:
~/Library/Preferences/com.apple.security.plistlike mentioned in the other post above
- resetting my default keychain