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From Erin Dalzell <>
Subject Tomcat not working behind a NAT?
Date Thu, 24 Jul 2003 19:39:27 GMT
Hi there,

We have just discovered that our tomcat web app is not working correctly
behind a NAT. Our actual web app works fine, but when we try to access our
management pages via http. It doesn't work. Any static pages are served up
correctly through our defined tomcat port (6300), but any dynamic content
(to several different servlets) don't work.

When we run a sniffer, it looks like tomcat tries to communicate with itself
on a very high (and random) port. For example, if our tomcat is accessible
locally as and externally as and we access from
withing our network (10.10.x.x) everything works fine and tomcat is able to
talk to itself on port 45000. But if I access it from an external site,
tomcat tries to communicate with itself on the address and the NAT
doesn't like it.

So, I have a few questions:
	1) why doesn't tomcat (we are using version 4) use localhost to
communicate with itself?
	2) anyone else seen this problem?
	3) can the high port be configured?




Erin Dalzell
eXpresso Product Specialist
Epic Data

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