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General network error when trying to data compare over VPN

tbwerztbwerz Posts: 2
edited September 27, 2005 1:50PM in SQL Compare Previous Versions
Hi,

When the SQL Compare tool attempts to accesss the remote server during a schema compare, I get the following error:

The tools says:
"Registering xxx.xxx.xxx.xxx.DBName" at the top
"Reading tables"
Then it hangs and then gives me an error:
"General network error. Check your network documentation."

I am running the latest version (3.41) of the red gate software. I am connected to a local server and have established a VPN connetion to a remote server. I am using the SA login to connect to both servers. When I enter the L/P for hte remote server, I can see the list of databases that exist on that server and have selected the one I want to compare to my local database.

Does anyone have any ideas as to what might be causing this? I can telnet to port 1433 and because I am getting the list of databases from the remote server, so I suspect that I can receive UDP traffic on 1434 too. The network admin who set this VPN connection up for me says that nothing should be blocked over this connection.

Also, I am specifing the IP address of the remote server, rather than a server name (it could not find it by name, I think DNS isn't set up to handle name resolution correctly).

Just for fun I ran the DTS compare utility between the two servers and it was able to compare them fine, which leads me to belive this is a problem with the software, rather than a network configuration problem.

Thanks,
Tom

Comments

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    Hi Tom

    This may be due to packet fragmentation over the vpn.

    You may wish to try using the ping command and setting the option not to fragment the packet (-f) and start to increase the size of the packet from 1400 up to 1514 (using -l).
    I had a similar problem in the past with replication over the vpn and eventually had to limit the mtu size by changing a registry key that forced it to be 576 over an external network.

    Regards
    Dan
    Daniel Handley
    Red Gate Software Ltd
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