[Info-vax] TCP/IP v5.6-9ECO3 problem

[Steven Underwood]

"FrankS" <sapienza at noesys.com> wrote in message 
news:46cd39cf-01ad-470f-afab-a7994aa10fff at m15g2000vbl.googlegroups.com...
> Follow up again.
>
> I worked my way backwards through the ECOs with the following results:
>
> v5.6-9 ECO 3  -- doesn't work
> v5.6-9 ECO 2  -- doesn't work
> v5.6-9 ECO 1 -- doesn't work
> v5.6-9 -- doesn't work
> v5.5-11 ECO 3 -- worked!
>
> I have no idea why none of the v5.6 variants would fail, but that is
> what happens.  As soon as the connection is attempted the FTP server
> entered a CPU loop and just sits there spinning.
>
> There must be something about the packets being sent that causes the
> problem.  This particular site has a bunch of firewall, VPN, and VLAN
> routers between the PC world and the OpenVMS world so perhaps
> somewhere along the line the packets are getting munged in a way that
> is not evident on a directly connected network.
>
> I compared the TCPtrace output from the failed sessions with the
> working sessions and don't see anything obviously different in the
> content.  I'll have to check my home network (no firewalls, VPNs, or
> VLANs involved) to see if the trace results show any variations.

Could it be something as simple as the default route setting on the VMS side 
where the packets are never getting back to the client.