Exchange 5.5 OWA (only admins can log in)

I have a Exchange 5.5 server running on Windows 2000 in a NT 4.0 Domain

My users can no longer log into OWA, only administrator accounts, they get a blank message prompt after the login prompt, the error message says nothing, then you click ok and the error says "The Exchange Servers is unavailable"

again if I log in as a member of the administrators group I can access OWA no problem

as far as I know there have not been any changes?
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LeeDerbyshireConnect With a Mentor Commented:
The entire section refers to permissions on the IIS server.
In IIS5 (i.e. on W2K server), Basic Auth (OWA 5.5 uses Basic Auth) requires that users have the Log On Locally right on the IIS server.  Do they still have that right?
tkthelpdeskAuthor Commented:
OWA is hosted on IIS 5.0 is running on a seperate server than exchange (forgot to mention)

I have tried adding "everyone" to the Log on Locally setting.

I can't add the users because its NT and won't show up in the list of accounts so I added "everyone"

If possible to add the users in a NT domain on this server (how could I?)

also should these rights be added to both Exchange and the server hosting the OWA?

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It's only the IIS server that is affected by this.  Adding Everyone is usually sufficent.  The best way to make sure is to sit at the console of the IIS server, and try to log in as one of the affected users.  If the login prompt keeps appearing, they won't be able to use OWA.
tkthelpdeskAuthor Commented:
I am able to log into the server running IIS hosting OWA

when I try and access the OWA site with the same account I get

first the landing page that wants you to type your profile

then the logon prompt (I enter a non admin user and password)

then I get a blank error message with no information (I click OK)

then I get "Failed to connect to the Exchange Server"
The best place to look first (and it's often overlooked) is the built-in owa troubleshooting text.  Try going to http://servername/exchange/tshoot.asp
tkthelpdeskAuthor Commented:
Failed to Connect to the Microsoft Exchange Server <servername>
This is another error message you may receive when you attempt to log on to a mailbox through the Outlook Web Access client. Use the following checklist to troubleshoot this error:
 Should these permission checks etc be done on the EXCHANGE server or the web server hosting OWA?
tkthelpdeskAuthor Commented:
ok I did the first part and made sure "domain users" have the right permissions on Exchsrvr\Webdata and Exchsrvr\Webtemp as it said

now I have some users who can access it and others that cannot

the users that can connect are in the domain users group, the users that cannot connect are in the domain users groups as well

should I just give "everyone" group the same access to these folders?

the error that some users get is different

the go to the landing page and enter there alias
the get the login prompt and enter there username and password
then they get a "receive 500 Internal Server Error" (which is different)

So I am halfway there it seems? I only did the permission changes on the webdata and webtemp folders, I did not do anything else since that seemed to get it working partially
Is there anything else displayed, other than '500 - internal server error'?  That is a general status code which means that 'something went wrong with the application at the server end'.  There should be a more specific error code and description.  If not, make sure that your IE does not have 'Friendly HTTP Errors' enabled in the options.
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