We are having what sounds like a similar problem (although 7.0.26 works for us) 
and can provide our details.

We are using Solaris 10, Tomcat 7.0.26, Apache/2.2.16, mod_jk/1.2.35 and 
Java(TM) SE Runtime Environment (build 1.6.0_30-b12) in our production 
environment. We are using the same except for the latest Tomcat 7.0.29 in our 
test environment.

Recently one of our testers found that when using IE8 against our test environment she 
could not download PDFs (available as links on web pages) and would instead see the error 
"A network error occurred while accessing this document on the Internet" but it 
worked fine on the older Tomcat in production.  Indeed if I roll our testing environment 
back to Tomcat 7.0.26, this problem does not occur.  It also doesn't occur in any other 
browser we tried (IE9, FireFox 14.0.1 and Safari 5.1.7).

I had remembered that something similar had been discussed on this list, but 
the archived thread looks like it went stale when it couldn't be reproduced:
PDF Download problem tomcat >= 7.0.27 
(http://mail-archives.apache.org/mod_mbox/tomcat-users/201207.mbox/%3CCAC=HunuF5zqKf5s_D9syTZ1J2nFXdCjEWKj=zq+hc8bgnn1...@mail.gmail.com%3E)

A good portion of our visitors use IE8 with the 9.5.1 Adobe Reader and we have 
a number of PDF documents available for download so I'm hoping perhaps our 
different configuration to the ones previously reported might eventually lead 
to a fix.

As I have answered to Chris, it came down that the downgrade to 7.0.26 fixed it. Only a person reports problems that with a particular PDF file so we have assumed it's an issue with his setup. I couldn't reproduce the issue as I did with 7.0.29, so it seems there is something wrong with that version.

Thanks!

Miguel

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