Port 80 performance slow compared to port 8080

We have a web server sitting in a DMZ. Performance when connecting to the site from the outside world is fine, but it's remarkably sluggish when connecting from the inside. There are no firewall blocks set up and syslog shows no complaints. Also, our content filter is not touching this site. A sniff shows multiple lost segments and retransmits.

However, our dev site on the same server, going over port 8080, is lightning fast (from inside or out). The production site is fast on the web server itself, but is slow from another machine in the same DMZ. Strangely (to me, anyway) if I change the IIS settings for the production site to 8080 (from 80) it, too, is suddenly very fast from the inside.

There are no access rules affecting the box internally, and the internal DNS is set up properly.

Is there something with PIX that affects port 80 traffic that is not obvious at first glance? Or a bug in the IOS?
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chabuhiAsked:
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chabuhiConnect With a Mentor Author Commented:
Turns out there were a number of contributing factors -- filter ties to the old webserver, firmware out of date on the server NIC, etc. No points awarded as solution was discovered internally.
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avidyaCommented:
Hi,

You didn't specify the versions you are using, but maybe this link will help you
http://www.cisco.com/pcgi-bin/search/search.pl
Search for: pix 80 8080 slow
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chabuhiAuthor Commented:
I'm sorry -- left that out in my haste to go fatten myself up some more ...

Server is Win 2003

IIS 6.0

Cisco FWSM 1.2.3
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avidyaCommented:

Maybe you can use the troubleshooting options:
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/mod_icn/fwsm/fwsm_2_2/fwsm_cfg/monitor.htm
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/mod_icn/fwsm/fwsm_2_2/fwsm_ref/df.pdf

From wath I read it looks like a problem with the settings in combination with the dmz.
Maybe you are better of reallocating your question in the Networking or security area?
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