Sympatico and VPN

[Peter L. Peres]

On Tue, 19 Oct 2004, Ilya Palagin wrote:

> Hi,
>
> We have a weird problem with Sympatico too.  I found that Sympatico used to
> block VPN ports, because "VPN is normally a business thing and they don't want
> business stuff ran on residental lines".  Now they say they do not really block
> any ports except for ports with known vulnerabilities like blaster worm (well,
> they don't provide with a list of ports being blocked).  Anyway, the problem is
> that at least two Sympatico customers have problems with their client software,
> which sends queries to MS SQL+Access database .  If amount of transferred data
> is small, it works.  But with normal load MS SQL Query generates error:
>
> "ODBC source: 172.16.1.2\VIDATABASE - working OK UID - User Pass - ******
> Microsoft Acces, linked tables, select list of available tables, tables
> imported to Access database - working OK Open tables - error, ODBC call failed"
>
> The same problem was replicated by us on another Sympatico line.  It used to
> work without any problem.  Maybe someone experienced similar issues and found
> how to overcome it?  Or Sympatico just found a way to break VPN connections
> without blocking ports?

You should sniff the transaction. You can do it with a laptop running 
linux plugged into the hub where the client is and tcpdump or something 
heavyer.

Peter
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