I'm experiencing troubles logging in to gw8 webaccess.

I have checked "eDirectory Authentication" in C1 for my postoffice, and did not check LDAP Authentication.

When i try to log in I just get the message
Your mailbox is unavailable. Please contact your system administrator.
The debug window of my poa gives me the following message:
21:33:50 568 C/S Login WebAccess  ::GW Id=mfischer :: [::ffff:193.170.x.x]
Any hints?