Re: [gdm-list] gdm --no-console + X-Server from Windows does not work

[Brian Cameron <Brian Cameron Sun COM>]

Joachim:

You might try updating to the latest GDM 2.18 version if you can, since
there have been some XDMCP fixes in the latest code.

Some other common gotchas:

Some people have reported that changing the DisallowTCP setting in the
GDM configuration makes a difference for XDMCP connections.  Does
changing the value help?

Also, some users have complained that firewall settings can make XDMCP
behave oddly, so you might want to make sure you aren't hitting an odd
firewall issue.

Some users have complained that enabling or disabling IPv6 when
configuring GDM makes it behave differently, so you might try changing
this configure setting and see if that helps.

Let me know if any of these things help.  From looking at your logs, it
isn't clear what the problem is to me.

Brian


> System is Debian Etch, fresh install, no upgrade from Sarge or beta Etch.
> gdm --version
> GDM 2.16.4
>
> gdm works locally on that machine like a charm, I start gdm, I get the 
> graphical login, do login, play around, no problems.
> The problems arise when I try to connect from a Windows machine (Starnet 
> xwin32, xming, and others tried):
> I get no login screen, I only get the gray X Pattern and the X cursor.
>
> The strange messages in syslog which I cannot tell what they are for:
> Jun 18 21:37:48 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Session id 
> 614918324 already managed
> ----
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Looked up 
> jou.internal.intra:0
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_choose_indirect_lookup: Host 
> 192.168.33.33 not found
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_forward_query_lookup: Host 
> 192.168.33.33 not found
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_display_manage: Managing 
> jou.internal.intra:0
>
> I must note that the local DNS is configured, forward and reverse gives 
> the right answer. 192.168.33.1 is the Debain machine, 192.168.33.33 is 
> my Windows machine.
>
> When I do "export DISPLAY=192.168.33.33:0" from a parallel ssh session 
> while watching the gray X pattern I can start the X programs and gnome 
> desktop from the ssh shell. They appear on the right X screen over the 
> network and work as expected. The strange syslog messages stop by then.
>
> gdm.conf is simple:
> [daemon]
> #This is just a try, with or without RemoteGreeter no difference
> RemoteGreeter=/usr/lib/gdm/gdmgreeter --disable-sound --disable-crash-dialog
> User=gdm
> Group=gdm
>
> [security]
> AllowRoot=true
> AllowRemoteRoot=true
> DisallowTCP=true
>
> [xdmcp]
> Enable=true
> Use24Clock=true
>
> [gui]
>
> [greeter]
> ShowLastSession=false
>
> [chooser]
>
> [debug]
> Enable=true
>
> [servers]
> # none defined
>
>
> The syslog shows following:
> Jun 18 21:37:14 nearyou gdm[16543]: set config key debug/Enable to 
> boolean true
> Jun 18 21:37:14 nearyou gdm[16543]: set config key daemon/Greeter to 
> string /usr/lib/gdm/gdmgreeter
>
> <snipped a few "set config" lines, you can have them if you need them of 
> course>
>
> Jun 18 21:37:14 nearyou gdm[16545]: gdm_main: Here we go...
> Jun 18 21:37:14 nearyou gdm[16545]: XDMCP: Start up on host nearyou, 
> port 177
> Jun 18 21:37:14 nearyou gdm[16545]: Accepting XDMCP connections...
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_decode: Received opcode 
> QUERY from client 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_query: Opcode 2 
> from 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_host_allow: 
> client->hostname is jou.internal.intra
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_send_willing: Sending 
> WILLING to 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_decode: Received opcode 
> REQUEST from client 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_request: Got 
> REQUEST from 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_host_allow: 
> client->hostname is jou.internal.intra
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_request: 
> xdmcp_pending=0, MaxPending=4, xdmcp_sessions=0, MaxSessions=16, Manuf
> acturerID=
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_display_dispose_check 
> (jou.internal.intra:0)
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_auth_secure_display: Setting up 
> access for jou.internal.intra:0
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_auth_secure_display: Setting up 
> access
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_auth_secure_display: Setting up 
> access for jou.internal.intra:0 - 1 entries
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_display_alloc: 
> display=jou.internal.intra:0, session id=614918324, xdmcp_pending=1
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_send_accept: Sending 
> ACCEPT to 192.168.33.33 with SessionID=614918324
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_decode: Received opcode 
> MANAGE from client 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Got MANAGE 
> from 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_host_allow: 
> client->hostname is jou.internal.intra
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Got 
> Display=0, SessionID=614918324 Class=MIT-unspecified from 192.168.33.33
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Looked up 
> jou.internal.intra:0
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_choose_indirect_lookup: Host 
> 192.168.33.33 not found
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_forward_query_lookup: Host 
> 192.168.33.33 not found
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_display_manage: Managing 
> jou.internal.intra:0
> Jun 18 21:37:46 nearyou gdm[16545]: loop check: last_start 0, last_loop 
> 0, now: 1182195466, retry_count: 0
> Jun 18 21:37:46 nearyou gdm[16545]: Resetting counts for loop of death 
> detection
> Jun 18 21:37:46 nearyou gdm[16546]: gdm_slave_start: Starting slave 
> process for jou.internal.intra:0
> Jun 18 21:37:46 nearyou gdm[16546]: gdm_slave_start: Loop Thingie
> Jun 18 21:37:46 nearyou gdm[16546]: gdm_slave_run: Opening display 
> jou.internal.intra:0
> Jun 18 21:37:46 nearyou gdm[16545]: gdm_display_manage: Forked slave: 16546
> Jun 18 21:37:48 nearyou gdm[16545]: gdm_xdmcp_decode: Received opcode 
> MANAGE from client 192.168.33.33
> Jun 18 21:37:48 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Got MANAGE 
> from 192.168.33.33
> Jun 18 21:37:48 nearyou gdm[16545]: gdm_xdmcp_host_allow: 
> client->hostname is jou.internal.intra
> Jun 18 21:37:48 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Got 
> Display=0, SessionID=614918324 Class=MIT-unspecified from 192.168.3
> 3.33
> Jun 18 21:37:48 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Session id 
> 614918324 already managed
> Jun 18 21:37:52 nearyou gdm[16545]: gdm_xdmcp_handle_manage: Got 
> Display=0, SessionID=614918324 Class=MIT-unspecified from 192.168.33.33
>
> The last 5 lines repeat endlessly until I give up the session or force a 
> program from a parralel ssh session on that display. The id is random 
> upon every new try.
>
> Another thing for compiling gdm on that etch machine (gdm 2.18.2 sources):
> ./configure gives me:
> checking for XML::Parser... configure: error: XML::Parser perl module is 
> required for intltool
>
> I cannot install XML::Parser using cpan, this package seems to bee to 
> old and (maybe) has been thrown out since it does not work with current 
> perl, I was unable to get it on normal ways.
>
> This also means I cannot compile gdm from the sources on my own *sigh*.
>
> I hope I can get some clues what is wrong with my linux server, google & 
> co didn't give a working answer.
>
> Joachim Otahal
>
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