The username parsing of the commandline options is done before we read the smb.conf so the username is not fully parsed. smbclient -UDOMAIN+username This does not set DOMAIN as the domain name but handles 'DOMAIN+username' as the connecting username!
Created attachment 13295 [details] patch for 4.6 I've backported the patch, test is working.
Karolin, please add the patch for the next 4.6 release. Thanks!
(In reply to Andreas Schneider from comment #2) Pushed to autobuild-v4-6-test.
(In reply to Karolin Seeger from comment #3) Pushed to v4-6-test. Closing out bug report. Thanks!