I seem to be having a similar problem. The admin account worked for a day and now all of a sudden I get "Authentication Failed":
I tried logging in with a different account with Admin privileges but got the same message. Tried to create a new account with Admin privileges...same thing:
2006-11-28 10:51:35,097 WARN [http-7071-Processor50] [ip=xxxxxx;] security - cmd=AdminAuth; account=admin; error=authentication failed for admin;
zm* commands work fine. Just cannot log in thru the UI. Any clue?
2006-11-28 11:58:34,563 INFO [http-7071-Processor48] [ip=127.0.0.1;name=zimbra;] security - cmd=CreateAccount; firstname.lastname@example.org; zimbraIsAdminAccount=TRUE;
2006-11-28 11:58:47,293 WARN [http-7071-Processor49] [ip=xxxxxx;] security - cmd=AdminAuth; account=theadmin; error=authentication failed for theadmin;