[Openswan Users] Very very strange problem, cured by (arrrrrgh) a reboot.

Greg Scott GregScott at Infrasupport.com
Fri Jun 25 15:45:35 EDT 2010

I don't even know how to describe this in a subject line.  This is a
single tunnel connecting two sites.  Both are running U2.6.25 on Fedora
12.  A telecom issue took out the left side yesterday. The telecom
issues were fixed a few hours ago and folks on the left side could ping
the right side.  The tunnel was up and running again.  Well sort of.
Exactly one user on the left side was able to launch an RDP session to
the RDP server on the right side.  Nobody else could make this happen.
However, everyone on the left side could ping any host they wanted on
the right side. They could do RDP sessions to **other** hosts on the
right side, just not this particular host - the one everyone cared


The left side is 10.86.2.nnn/24, right side 10.86.0.nnn/24.  The
relevant terminal server on the right side is  The right
side also has 2 other servers at .9 and .15.  


Watching tcpdump on both sides, I saw tcp 3389 stuff (RDP packets)
coming out of the left side, but never reaching the right side.
Curiously, the left side sent out ARP queries looking for,which is weird because that's a completely different subnet.


But here is the strange part.  The Windows XP host at could
successfully do RDP sessions to and, but not to 


In desperation, I rebooted the left side firewall, restarting
everything, and now it all works.  Everyone is up and running.  It's not
possible to make up this kind of stuff.  How in the world do I
troubleshoot something bizarre like this??


Here's a record from /var/log/secure.  This was during the outage


Jun 25 11:12:09 localhost pluto[2288]: "garelick-hq" #667:
STATE_MAIN_R3: sent MR3, ISAKMP SA established {auth=OAKLEY_RSA_SIG
cipher=aes_128 prf=oakley_sha group=modp2048}


Any thoughts?




-          Greg Scott

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