Re: gdm error message

[psz maths usyd edu au (Paul Szabo)]

On 26 Aug 2002, George wrote in response to Melinda:

>> I have recently enabled XDMCP on my new linux server so that users in my
>> local network can connect to the server using their xterms.
>> 
>> However I keep seeing the following message in /var/log/messages:
>> 
>> gdm[1241]: gdm_xdmcp_decode_packet: Unknown opcode from host XXX.XX.XXX.XX
>> 
>> All the IP's are valid IP's for xterms in the dept. but I am not sure
>> exactly what the error message is telling me? ANyone have any ideas?
> 
> Hmmm, this means that they're sending an opcode that gdm doesn't know.  GDM
> should support all the opcodes in the XDMCP spec, perhaps this is some vendor
> extension.  Or perhaps they're sending something out of sequence.  Can you turn
> on debugging and see what else gets written to syslog?

I now see the exact same messages, for hosts/terminals running XWin32 on
Windows2000, about once per hour while ever XWin32 is running. Those
terminals should not access the GDM host logging the message at all and
should not broadcast anything, but do an XDMCP "query" connection to some
other server.

Should I simply ascribe this to a bug in XWin32 and ignore these messages?

Thanks,

Paul Szabo - psz maths usyd edu au  http://www.maths.usyd.edu.au:8000/u/psz/
School of Mathematics and Statistics  University of Sydney   2006  Australia