network permission for deployed application.

I have a strange case and would like advise.
I have an application deployed to a server (web based)
ONE of the pages gets a  "error loading page, 403 forbidden" code.
None of the other pages get this error.
The user can add information (done on a different) but when coming back to the main page - the information does not show (while it is saved in the db) - and the error shows up.
IF logged into the server - the same page which shows an error on the workstation does not return and error and all information entered from the workstation shows up correctly.

What could be causing this? suggestions?
TagomAsked:
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btanExec ConsultantCommented:
Quick one is by far the most common reason for this error is that directory browsing is forbidden for the Web site. Most Web sites want you to navigate using the URLs in the Web pages for that site. They do not often allow you to browse the file directory structure of the site. This is true for most Web sites on the Internet - their Web server has "Allow directory browsing" set OFF.

http://www.checkupdown.com/status/E403.html
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btanExec ConsultantCommented:
Saw something
http://www.403forbiddenerror.org/

There are 17 different types, sub status of HTTP Error 403

403.1 - Execute access forbidden.
403.2 - Read access forbidden.
403.3 - Write access forbidden.
403.4 - SSL required.
403.5 - SSL 128 required.
403.6 - IP address rejected.
403.7 - Client certificate required.
403.8 - Site access denied.
403.9 - Too many users.
403.10 - Invalid configuration.
403.11 - Password change.
403.12 - Mapper denied access.
403.13 - Client certificate revoked.
403.14 - Directory listing denied.
403.15 - Client Access Licenses exceeded.
403.16 - Client certificate is untrusted or invalid.
403.17 - Client certificate has expired or is not yet valid.
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TagomAuthor Commented:
Great resource article, thank you.
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Networking Protocols

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