Forum OpenACS Q&A: Re: Initial "Server Not Found" error, then okay

I see a similar behaviour on my old machine that I use for development (it only has 64Mb as I robbed the other memory to fix another machine). In my case I get 'server not found' if I access the machine too soon after starting nsd. This is because it takes time to build up momentum and get postgres going with so little memory. I watch the processes with 'pidof nsd' to see when things have started up and accessing after that is fine.

What happens if you leave it for a minute or two before accessing?

This is not a startup issue -- the machine runs 7 x 24 and this phenomenon occurs on a regular basis.  I don't believe it's a memory issue either.  The box has 512MB of RAM, and a quick look at top as I type shows 70MB physical memory free, thus everything should be running in real memory.
Is there anything in your AOLserver error log? It could be just a browser issue? Have you seen it happen in more than one browser?