Cygwin/X XDMCP Issue

[Maarten Hoes]

On 23-2-2015 16:33, Maarten Hoes wrote:
> On 23-2-2015 16:11, Maarten Hoes wrote:
>>
>> I suspect something strange is going on under the covers of my ISP
>> supplied FRITZ!Box 7390, but I cant figure out what...
>
> Looks like I managed to seriously mess up my network settings, alright.
>  From another Linux host on the same subnet (192.168.0.31), I get these
> ICMP messages when I try to start an X/XDMCP session to it:
>
>
>
>    4   0.000292 192.168.0.31 -> 192.168.0.20 ICMP 77 Destination
> unreachable (Host administratively prohibited)
>    7   1.989470 192.168.0.31 -> 192.168.0.20 ICMP 77 Destination
> unreachable (Host administratively prohibited)
>   12   5.989469 192.168.0.31 -> 192.168.0.20 ICMP 77 Destination
> unreachable (Host administratively prohibited)
Oh wait, thats just the default iptables ruleset on Fedora (phew).

Well I changed the range back to 192.168.178.0/255.255.255.0, and now it 
works again. Guess ill do some digging around later looking for root 
causes when I have more time, but for now it's good enough for me.
;)

Thanks for the help,


- Maarten




   1 0.000000000 192.168.178.20 -> 192.168.178.21 XDMCP 49 Query
   2 0.038915000 192.168.178.21 -> 192.168.178.20 XDMCP 99 Willing
   3 0.213517000 192.168.178.20 -> 192.168.178.21 XDMCP 352 Request
   4 0.213793000 192.168.178.21 -> 192.168.178.20 XDMCP 94 Accept
   5 0.213875000 192.168.178.20 -> 192.168.178.21 XDMCP 71 Manage
   6 0.221893000 192.168.178.21 -> 192.168.178.20 TCP 74 42824â+'6000 
[SYN] Seq=0 Win=29200 Len=0 MSS=1460 SACK_PERM=1 TSval=4294947644 
TSecr=0 WS=128
   7 0.221999000 192.168.178.20 -> 192.168.178.21 TCP 74 6000â+'42824 
[SYN, ACK] Seq=0 Ack=1 Win=65535 Len=0 MSS=1460 WS=4 SACK_PERM=1 
TSval=35608 TSecr=4294947644
   8 0.222094000 192.168.178.21 -> 192.168.178.20 TCP 66 42824â+'6000 
[ACK] Seq=1 Ack=1 Win=29312 Len=0 TSval=4294947644 TSecr=35608
   9 0.222233000 192.168.178.21 -> 192.168.178.20 X11 114 Initial 
connection request
  10 0.222453000 192.168.178.20 -> 192.168.178.21 TCP 74 [TCP segment of 
a reassembled PDU]
  11 0.222515000 192.168.178.20 -> 192.168.178.21 TCP 1514 [TCP segment 
of a reassembled PDU]
  12 0.222529000 192.168.178.20 -> 192.168.178.21 TCP 1514 [TCP segment 
of a reassembled PDU]
  13 0.222536000 192.168.178.21 -> 192.168.178.20 TCP 66 42824â+'6000 
[ACK] Seq=49 Ack=9 Win=29312 Len=0 TSval=4294947645 TSecr=35608
  14 0.222539000 192.168.178.20 -> 192.168.178.21 X11 254 Initial 
connection reply
  15 0.222602000 192.168.178.21 -> 192.168.178.20 TCP 66 42824â+'6000 
[ACK] Seq=49 Ack=3093 Win=35456 Len=0 TSval=4294947645 TSecr=35608
  16 0.222715000 192.168.178.21 -> 192.168.178.20 X11 86 Requests: 
QueryExtension
  17 0.222820000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: 
QueryExtension
  18 0.222908000 192.168.178.21 -> 192.168.178.20 X11 70 Requests: 
BIG-REQUESTS
  19 0.223006000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: BIG-REQUESTS
  20 0.223102000 192.168.178.21 -> 192.168.178.20 X11 110 Requests: 
CreateGC, GetProperty
  21 0.223186000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: GetProperty
  22 0.223290000 192.168.178.21 -> 192.168.178.20 X11 86 Requests: 
QueryExtension
  23 0.223470000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: 
QueryExtension
  24 0.223570000 192.168.178.21 -> 192.168.178.20 X11 74 Requests: XKEYBOARD
  25 0.223659000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: XKEYBOARD
  26 0.224025000 192.168.178.21 -> 192.168.178.20 X11 102 Requests: 
OpenFont, QueryExtension
  27 0.224145000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: 
QueryExtension
  28 0.224244000 192.168.178.21 -> 192.168.178.20 X11 82 Requests: 
RENDER, RENDER
  29 0.224331000 192.168.178.20 -> 192.168.178.21 X11 98 Reply: RENDER

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