Re: Putty 0.53 hangs if Micrsoft VPN connection is started
From: Richard E Silverman (res_at_qoxp.net)
Date: 06/23/03
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Date: 23 Jun 2003 16:27:23 -0400
>>>>> "PB" == PieterB <pieterb@gewis.nl> writes:
PB> Hi there, This happens to me quite often. When you open a SSH2
PB> connection to a host, and then open a Microsoft VPN (MS-CHAP2)
PB> connection, the SSH2 connection will not respond anymore.
PB> Does anybody know if this is fixed in 0.53b? Is this a problem
PB> with Putty, or with Microsoft or Microsoft TCP/IP stack.
PB> Workaround is of course to first close all Putty session, and then
PB> create the VPN connection and log back in.
PB> Tested with Microsoft XP (all recent patches applied).
This probably has nothing to do with SSH. When you open a VPN connection,
it will normally alter your default route to send all non-local traffic
over the tunnel to the remote network. So existing TCP connections to
other external destinations are likely to become unusable for a variety of
reasons. Even if the peer is reachable via the new route through the VPN
network, NAT/firewall/addressing restrictions may prevent your packets
from getting there, or from being recognized if they do.
You can fix this on a case-by-case basis by installing a route to the peer
following the original path, after you bring up the VPN.
-- Richard Silverman res@qoxp.net
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