Can't connect with XDMCP - Invalid MIT-MAGIC-COOKIE-1 key

[Harold L Hunt]

Alexander,

It sounds like your problems are probably due to a sector of your network 
using only internal IP addresses (10.x.x.x, 192.168.x.x) that are not being 
passed through a Network Address Translation system when they are routed to 
the sector of your network with valid external IP addresses.  In other words, 
your IP address is being lost by the router for some reason, while the packet 
is not being dropped for some other reason.  Thus your HP-UX machine sees a 
packet that came from 0.0.0.0 instead of, say, 10.0.0.100.

That is my theory... and it seems pretty likely because your machine is not 
having a problem getting the IP address being used by your adapter when it is 
on one segment of the network, so it shouldn't be having problems on the 
other segment of the network either.

Now, for the hard-hitting questions:

1) Are you using the same network adapter on both network segments.  That is, 
you aren't using a wireless adpater on one segment and a wired adapter on 
another segment, are you?

2) Are you using DHCP or not using DHCP on both networks?  That is, does one 
segment use DHCP but the other does not?

3) Can you do a ``traceroute'' to the HP-UX workstations from the network 
segment that does not work with XDMCP?  It would be nice to get some sort of 
confirmation that you can at least get packets back from the HP-UX 
workstations.


With those answers, we may be better able to help you.

Harold

Alexander Skwar <lists.ASkwar@email-server.info> said:

> Hi!
> 
> I've installed cygwin/xwin on my Windows XP machine so that I can connect
> to other hosts using XDMCP; ie. I want to run XWin.exe -query host.
> 
> I'm succesfull in doing so when I'm connect to a certain part of the
> company LAN network.  However, from another part of the network, I cannot.
>  I'm trying to connect to HP-UX 11.00B workstations.  In /var/dt/Xerrors I 
get:
> 
> Xlib: connection to "0.0.0.0:0.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Xlib: connection to "0.0.0.0:0.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Xlib: connection to "0.0.0.0:0.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Xlib: connection to "0.0.0.0:0.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Xlib: connection to "0.0.0.0:0.0" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> 
> Wed Nov 27 08:47:46 2002
> error (pid 4808): Server open attempt #0 failed for 0.0.0.0:0, giving up
> 
> At the same time, my XWin.log contains:
> 
> Fatal server error:
> XDMCP fatal error: Session failed Session 6 failed for display 0.0.0.0:0:
> Cannot open display
> 
> Any ideas about what I'm missing?  What's striking me, is that I'm able to
> connect to the workstations from certain parts of our network with the
> exact same setup - of course the IP adresses and routing is different.
> 
> Thanks a lot,
> 
> Alexander Skwar
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