I run a Mac mini as a server in a small company. With macOS Server. Also a print server with a few shared printers.
This is the error message in the CUPS log:
Unable to encrypt connection, internal error
Yesterday the macserver.local self signed certificate expired. So I renewed it. Restarted the Mac. Still the same error.
What I tried:
- Restarting CUPS
- Turning off Sharing Printers (in system preferences > sharing)
- Changed trust settings of certificate in Keychain to Always
- Removed shared printer and re-add it again
- Everything suggested here: https://discussions.apple.com/thread/7610729 (excluding reinstalling macOS)
Still the same error. What is the solution for this problem? If there is additional information required please let me know.
Cups error log:
E [11/Oct/2018:19:57:26 +0200] [Client 16] Unable to encrypt connection: Internal error
cupsd (security) in console:
CSSM Exception: -2147409622 CSSMERR_TP_NOT_TRUSTED