Re: Putty 0.53 hangs if Micrsoft VPN connection is started

From: Richard E Silverman (res_at_qoxp.net)
Date: 06/23/03


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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