If cm_get_ipc_credentials() returned anonymous creds and signing is required we were returning the result of cm_get_ipc_credentials() instead of the original error.
Created attachment 12966 [details] Patch for v4-6-test
Created attachment 12967 [details] Patch for v4-5-test
Created attachment 12968 [details] Patch for v4-4-test
Reassigning to Karolin for inclusion in 4.4, 4.5 and 4.6.
Pushed to autobuild-v4-{4,5,6}-test.
(In reply to Stefan Metzmacher from comment #5) Pushed to all branches. Closing out bug report. Thanks!