ActiveX Data Objects (ADO) connection to a SQL through a firewall

ActiveX Data Objects (ADO) connection to a SQL through a firewall

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Subject Author Date
ActiveX Data Objects (ADO) connection to a SQL through a firewall Oliver Habegger 03-02-2005
Posted by Oliver Habegger on March 2, 2005, 1:25 pm
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Hi news group

We got a problem with a ADO connection to a SQL server. Since we got a
firewall between, connections get sometimes for no reasons terminated.

On the Microsoft KB site I found the following article about it:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q269882

I guess these are all TCP port, are they? An I need 2 rules
1) Inbound
Any -> SQL -> TCP/1433

2) Oubound
SQL -> Any -> TCP/1024-65535

Could that be true? ? Anyone aware of any timeout issue on that? In case
someone has experiance with that, please give me a feedback. The firewall is
a StoneGate, but I guess the same issue can be present with NetScreen or
Check Point .

TIA, Oliver



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Posted by Leythos on March 2, 2005, 1:12 pm
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On Wed, 02 Mar 2005 13:25:47 +0100, Oliver Habegger wrote:

> Hi news group
>
> We got a problem with a ADO connection to a SQL server. Since we got a
> firewall between, connections get sometimes for no reasons terminated.
>
> On the Microsoft KB site I found the following article about it:
> http://support.microsoft.com/default.aspx?scid=kb;en-us;Q269882
>
> I guess these are all TCP port, are they? An I need 2 rules
> 1) Inbound
> Any -> SQL -> TCP/1433
>
> 2) Oubound
> SQL -> Any -> TCP/1024-65535
>
> Could that be true? ? Anyone aware of any timeout issue on that? In case
> someone has experiance with that, please give me a feedback. The firewall is
> a StoneGate, but I guess the same issue can be present with NetScreen or
> Check Point .

When I setup a connection through the firewall on my WatchGuard I open
port 1433 from the DMZ to the LAN and from the LAN to DMZ - IP to IP rule.
I've always had this work for me.

As for time-out - I've had a number of problems with Netscreen firewalls
where we try and move large files (50GB) across two network ports on the
firewall and it always dies part way through. I replaced my Netscreen
firewalls with WatchGuard ones and eliminated the problem (after giving
the nice Netscreen support people 30 days to diagnose/fix the problem).


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