Webmin / Usermin and port blocking

[Bob Brennan]

Webmin and Usermin are accessed remotely through ports 10000 and 20000
respectively - as in http://www.myserver.net:20000

I work in a company that blocks port 20000 and all other non-essential
outgoing port requests. Are there any alternative ways of accessing a
port-bound service like this to get around secure large company sites
that block direct port connections?

I guess what I'm asking is about ways to access Usermin as a straight
HTTP:// connection (ie http://www.myserver.net/usermin) rather than
port 20000 by making changes on my server.

Thanks in advance,
bob