I tried a gdmchooser-launched xdmcp connection to ubuntu804 and that failed also. Earlier I reported that it succeeded.
I added Enable=true in the [debug] section of /etc/gdm/gdm.conf on circle and re-tried the connection from dellbuntu to generate this information from /var/log/daemon.log on circle: Apr 24 15:49:42 circle gdm[3444]: gdm_xdmcp_decode: Received opcode BROADCAST_QUERY from client 192.168.0.11 Apr 24 15:49:42 circle gdm[3444]: gdm_xdmcp_handle_query: Opcode 1 from 192.168.0.11 Apr 24 15:49:42 circle gdm[3444]: gdm_xdmcp_host_allow: client->hostname is dellbuntu.esfnet Apr 24 15:49:42 circle gdm[3444]: gdm_xdmcp_send_willing: Sending WILLING to 192.168.0.11 Apr 24 15:49:44 circle gdm[3444]: gdm_xdmcp_decode: Received opcode QUERY from client 192.168.0.11 Apr 24 15:49:44 circle gdm[3444]: gdm_xdmcp_handle_query: Opcode 2 from 192.168.0.11 Apr 24 15:49:44 circle gdm[3444]: gdm_xdmcp_host_allow: client->hostname is dellbuntu.esfnet Apr 24 15:49:44 circle gdm[3444]: gdm_xdmcp_send_willing: Sending WILLING to 192.168.0.11 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_decode: Received opcode REQUEST from client 192.168.0.11 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_handle_request: Got REQUEST from 192.168.0.11 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_host_allow: client->hostname is dellbuntu.esfnet Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_handle_request: xdmcp_pending=0, MaxPending=4, xdmcp_sessions=0, MaxSessions=16, ManufacturerID= Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_display_dispose_check (dellbuntu.esfnet:0) Apr 24 15:49:45 circle gdm[3444]: gdm_auth_secure_display: Setting up access for dellbuntu.esfnet:0 Apr 24 15:49:45 circle gdm[3444]: gdm_auth_secure_display: Setting up access Apr 24 15:49:45 circle gdm[3444]: gdm_auth_secure_display: Setting up access for dellbuntu.esfnet:0 - 1 entries Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_display_alloc: display=dellbuntu.esfnet:0, session id=2113196871, xdmcp_pending=1 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_send_accept: Sending ACCEPT to 192.168.0.11 with SessionID=2113196871 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_decode: Received opcode MANAGE from client 192.168.0.11 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_handle_manage: Got MANAGE from 192.168.0.11 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_host_allow: client->hostname is dellbuntu.esfnet Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_handle_manage: Got Display=0, SessionID=2113196871 Class=MIT-unspecified from 192.168.0.11 Apr 24 15:49:45 circle gdm[3444]: gdm_xdmcp_handle_manage: Looked up dellbuntu.esfnet:0 Apr 24 15:49:45 circle gdm[3444]: gdm_choose_indirect_lookup: Host 192.168.0.11 not found Apr 24 15:49:45 circle gdm[3444]: gdm_forward_query_lookup: Host 192.168.0.11 not found Apr 24 15:49:45 circle gdm[3444]: gdm_display_manage: Managing dellbuntu.esfnet:0 Apr 24 15:49:45 circle gdm[3444]: loop check: last_start 0, last_loop 0, now: 1240584585, retry_count: 0 Apr 24 15:49:45 circle gdm[3444]: Resetting counts for loop of death detection Apr 24 15:49:45 circle gdm[3444]: gdm_display_manage: Forked slave: 32476 Apr 24 15:49:45 circle gdm[32476]: gdm_slave_start: Starting slave process for dellbuntu.esfnet:0 Apr 24 15:49:45 circle gdm[32476]: gdm_slave_start: Loop Thingie Apr 24 15:49:45 circle gdm[32476]: gdm_slave_run: Opening display dellbuntu.esfnet:0 Apr 24 15:49:46 circle gdm[32476]: gdm_slave_xioerror_handler: Fatal X error - Restarting dellbuntu.esfnet:0 Apr 24 15:49:46 circle gdm[32476]: term_quit: Final cleanup Apr 24 15:49:46 circle gdm[32476]: gdm_slave_quick_exit: Will kill everything from the display Apr 24 15:49:46 circle gdm[32476]: gdm_slave_quick_exit: Killed everything from the display Apr 24 15:49:46 circle gdm[3444]: mainloop_sig_callback: Got signal 17 Apr 24 15:49:46 circle gdm[3444]: gdm_cleanup_children: child 32476 returned 2 Apr 24 15:49:46 circle gdm[3444]: gdm_child_action: In remanage Apr 24 15:49:46 circle gdm[3444]: gdm_display_unmanage: Stopping dellbuntu.esfnet:0 (slave pid: 0) Apr 24 15:49:46 circle gdm[3444]: gdm_display_dispose: Disposing dellbuntu.esfnet:0 Apr 24 15:49:46 circle gdm[3444]: gdm_display_unmanage: Display stopped -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org