No I haven't found the solution for this yet, though I've been rather busy so it hasn't gotten very much attention.  I'll give your solutions a try though.  Thanks.

I've been attempting to bring the Mercury B web interface online for my company's local intranet.  Mercury is hosted off of a computer listed as an ip address rather than a dns.  When I attempt to browse to http:/xxx.yyy.zzz/mlss.html I recieve a 404 error.  However, Mercury B logs the attempt for a connection.  I'm rather confused on this one and perhaps someone can point me in the right direction.

Mercury B Log:

Connection from 10.2.13.96, Wed Jun 01 14:08:43 2011
10.2.13.96: 0 sec. elapsed, connection closed Wed Jun 01 14:08:44 2011
Connection from 10.2.13.112, Wed Jun 01 14:09:31 2011
10.2.13.112: 0 sec. elapsed, connection closed Wed Jun 01 14:09:31 2011

Mercury B Section of Mercury.cfg:

[MercuryB]
Scratch : C:\MERCURY\Scratch\MercuryB
Logfile : C:\MERCURY\Logs\MercuryB\~y-~m-~d.log
Timeout : 120
Server_Port : 80
Session_logging : C:\MERCURY\Sessions\MercuryB
Session_logmode : 0
Idle_Timeout : 1800
SSL_Mode : 0
Alt_Server_Port : 443 

Did you sort this out?

Have you tried checking the security on the machine that Mercury is installed on - disable it and try again (to rule it out)?

Did you try specifying an alternate port? Or, set up an A record in your DNS for the machine and use that as a http:// target from the intranet?