[Solved] Cannot Log in to Server as InstanceAdminUser

I'm able to access the login screen at http://localhost for a ONE platform app. I cannot log in as InstanceAdminUser though.

The server console shows the following when attempting to log in:

08-24 15:58:28,385 INFO (pool-2-thread-1) [ ClientSsoSessionMonitor] Synchronized LastAccessDate to DB
08-24 15:58:50,703 INFO (0.0.0-80-exec-4) [ LogonAction] Authenticating AuthKey[null.InstanceAdminUser]
08-24 15:58:50,719 INFO (0.0.0-80-exec-4) [ LogonAction] Successfully authenticated AuthKey[null.InstanceAdminUser]
08-24 15:58:50,719 INFO (0.0.0-80-exec-4) [ LogonAction] Originally Requested URL -
08-24 15:58:50,720 INFO (0.0.0-80-exec-4) [ LogonAction] Requested appId - null
08-24 15:58:50,720 INFO (0.0.0-80-exec-4) [ LogonAction] No originally requested URL provided
08-24 15:58:50,732 INFO (0.0.0-80-exec-4) [ LogonAction] Redirect to 0
08-24 15:58:50,736 INFO (0.0.0-80-exec-4) [ LogonAction] Forward request to -  http://lap-mnutsch/oms/SsoCallBack?appId=0 
08-24 15:58:50,742 WARN (0.0.0-80-exec-1) [ RealmVerifier] RP discovery / realm validation disabled;
08-24 15:58:50,743 INFO (0.0.0-80-exec-1) [ Discovery] Starting discovery on URL identifier:  http://lap-mnutsch/sso/auth/id 
08-24 15:58:50,878 INFO (0.0.0-80-exec-1) [ YadisResolver] Yadis discovered 2 endpoints from:  http://lap-mnutsch/sso/auth/id 
08-24 15:58:50,878 INFO (0.0.0-80-exec-1) [ Discovery] Discovered 2 OpenID endpoints.
08-24 15:58:50,884 INFO (0.0.0-80-exec-1) [ ConsumerManager] Trying to associate with  http://lap-mnutsch/sso/openId  attempts left: 4
08-24 15:58:50,904 INFO (0.0.0-80-exec-1) [ ConsumerManager] Found an existing association: 2bc606cdb37bebb6
08-24 15:58:50,909 INFO (0.0.0-80-exec-1) [ ConsumerManager] Creating authentication request for OP-endpoint:  http://lap-mnutsch/sso/openId  claimedID:  http://specs.openid.net/auth/2.0/identifier_select  OP-specific ID:  http://specs.openid.net/auth/2.0/identifier_select 
08-24 15:58:50,910 INFO (0.0.0-80-exec-1) [ RealmVerifier] Return URL:  http://lap-mnutsch/oms/auth/openId?_origReqURL=http%3A%2F%2Flap-mnutsch%3A80%2Foms%2Fbase%2Fhome.action  matches realm:  http://lap-mnutsch/oms/auth/openId?_origReqURL=http%3A%2F%2Flap-mnutsch%3A80%2Foms%2Fbase%2Fhome.action 

What is going on and how do I fix it?