Steve on 04 Aug, 2018 04:03 PM
welcome to the GPGTools support platform. Sorry you are having problems using GPG Suite.
We've seen this error in relation to blocked key server communication. But I wonder how this would be relevant during decryption. But just in case: are you using any Firewall software like Little Snitch? If so, could you temporarily disable it and retry.
Does this problem persist after a restart of your mac?
Steve on 04 Aug, 2018 04:05 PM
PS: To benefit from the latest security fixes from apple, you may want to check for pending macOS updates in the MacAppStore. General info about Apple security releases including the latest macOS release.