Server fails to produce HTML pages

I have a Sun Ultra 170 running Solaris 2.5.  It is set up to run as an Internet Server.  I am using Netscape Enterprise version 2.0a as the Server Software.  The machine has four 'instances' setup for four individual web sites.
The system has 260Mb+ of Swap Space available and 64Mb RAM.
The other major piece of software running is the Muscat search engine.  On two of the site this search engine is running in its standard form. On the other it is running as a tailor-made version.
The server has some intermittent fault where the machine stops serving HTML pages to any client.  The machine is still running - with FTP and Telnet still active - but does not seem to be available to the 'outside world'.
I have had some previous external expert help and have practically ruled out a hardware fault.  The setup of Solaris seems to be okay.  The server logs do not seem to report anything out of the ordinary.
Can anyone help???
fishcakesAsked:
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adamolsonCommented:

  Hi...I have basically the same setup as you, so we'll be able to figure this one out easily I hope....what happens when you execute ./start?  does it say it can bind to the IP or not?  email me directly if you want at adam@humboldt1.com
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