Comment 142 for bug 150193

It is still a problem in Intrepid. Little more information from syslog.
There are two more threads with exact same issues in ubuntuforums...but no solutions.
Again, it worked before. Some update broke it.

Dec 22 17:06:18 server gdm[5366]: DEBUG: gdm_xdmcp_host_allow: client->hostname is 127.0.0.1
Dec 22 17:06:18 server gdm[5366]: DEBUG: Attempting to parse key string: debug/Enable=false
Dec 22 17:06:18 server gdm[5366]: DEBUG: gdm_xdmcp-handle_manage: Got display=1, SessionID=1181938353 Class=MIT-unspecified from MIT-unspecified1
Dec 22 17:06:18 server gdm[5366]: DEBUG: gdm_xdmcp_handle_manage: Failed to look up session id 1181938353
Dec 22 17:06:18 server gdm[5366]: DEBUG: XDMCP: Sending REFUSE to 1181938353
Dec 22 17:06:18 server gdm[5366]: DEBUG: gdm_forward_query_lookup: Host ::ffff:127.0.0.1 not found
Dec 22 17:06:18 server gdm[5366]: DEBUG: decode_packet: GIOCondition 1
Dec 22 17:06:18 server gdm[5366]: DEBUG: XDMCP: Received opcode QUERY from client ::ffff:127.0.1.1 : 60899
Dec 22 17:06:18 server gdm[5366]: DEBUG: gdm_xdmcp_host_allow: client->hostname is 127.0.1.1
Dec 22 17:06:18 server gdm[5366]: DEBUG: XDMCP: Sending WILLING to ::ffff:127.0.1.1