Unable to open Java Application in Internet Explorer 8

We run an application developed in JAVA and running on a server in Head Office (Frontend is JAVA & backend is MYSQL 5)

We've a number of remote users (connected via MPLS network) who are unable to access the  application using IE8. However, the remote users are able to get to the login pageif they open the URL in Firefox browser. There are no proxy servers used in our environment and all remote users have unrestricted access to this server.

The java application runs on SAGIOATT server on port 5555. The url is http://sagioatt:5555.

For users in head office (same LAN as the server), the application works on both IE8 & Firefox.

I'm clueless how to solve this. Any help will be greatly appreciated as I've to roll this out to production ASAP.
MohammedMazharuddinAsked:
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mccarlIT Business Systems Analyst / Software DeveloperCommented:
Can you use something like WireShark to get a bit more info about exactly what is happening, and what is different between the 2 browsers?

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MohammedMazharuddinAuthor Commented:
What info should I look in WireShark? I'm sorry, I'm not very familiar with usage of Wireshark.
mccarlIT Business Systems Analyst / Software DeveloperCommented:
Capture sequences from an IE8 browser trying to access the app, and then capture another set of sequences for Firefox accessing it, and then compare the differences. If you still don't know exactly how to compare them, post the .pcap files here and I can have a look for you!
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Sharon SethCommented:
Check IE's java settings . There should be some differences in these settings for the head office users and for the remote users
MohammedMazharuddinAuthor Commented:
This application doesn't need client side java to be present. Hence, java settings don't come into picture in my scenario.
Sharon SethCommented:
No client side java !! Then the problem dose not seem to be application/java specifc . Seems to be network settings
MohammedMazharuddinAuthor Commented:
Thank you guys for the solutions provided.

It was indeed a network issue and the routing was getting into trouble because of ISA Server.

Just by changing the default gateway it got solved. But I'm still puzzled how it was working on Firefox browser :)
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