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MS Sql Server connectivity slow using internal IP

I have this odd problem.  I have a server (Win 2003/ MS Sql Server 2005) that when I attempt to connect via SSMS using an INTERNAL IP address it's VERY slow and, in somecase, could timeout during it's attempts to connect. However, if I use this server's EXTERNAL IP address it's very fast.   This also happens when using Visual Studio to connect to this server's DB.  

I'm assuming there must be some sort of configuration setting or something to fix this but I have no idea what to look for.  What would make the connection to my database using the Internal address slow and yet, the External address is really fast?
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David Todd
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First thought is that it might be a network issue...

In the command prompt, try "tracert internal IP" and "tracert external IP" (no quotes)

The internal IP should only have one line or so. The external should have more. If the internal IP has multiple lines, it may be that your network is bouncing your around before you get to the server.
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I took up your suggestion on NOT using IP address and just specifying the servername/instance and it worked like a charm.  No lag... no delay... beautiful.  Thank you.