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I have a running Debian web server with ispconfig. The problem is that whenever I make a first connection it takes about 1-2 seconds to connect, after this 1st connection everything runs smoothly.

I suspect it has something to do with the DNS configuration.

How could I troubleshoot this?

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up vote 1 down vote accepted

Try to lookup your server's hostname at a client and your client machine's hostname at a server. If one of two takes long to lookup then you should change that hostname or add it to the /etc/hosts.

To know hostname of the server type hostname in the command line. Then on another server type nslookup <hostname>. If you get the IP address in the command's output — hostname resolves correctly. Example:

$ nslookup

Non-authoritative answer:

If hostname cound not be resolved you'll get answer like this:

$ nslookup google.local

** server can't find google.local: NXDOMAIN
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how can i do that? can you provide me the commands? thanks! – spacebiker Dec 7 '12 at 6:52
I edited my answer, added needed information. – Vladimir Smotesko Dec 7 '12 at 10:30

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