Why does OWA prompt user continually for credentials?

Tags:
Exchange 2003
Outlook Web Access
We're using Exchanger Server 2003 and we have an external user accessing email via Outlook Web Access (OWA) using Internet Explorer (IE). He has no problem accessing his email. The only problem he encounters is that OWA keeps prompting him for his user credentials (username and password) whenever he tries to open Microsoft Word and Excel attachments. It doesn't matter if he re-enters his credentials or cancels the prompts, the attachments will still open. It's just annoying that OWA keeps prompting the user for his credentials two to three times in a row. Under "Directory Security" in the Internet Information Services (IIS), we configured only "Basic Authentication." The "default domain" was entered. The "Anonymous" logon was disabled. Any assistance would be appreciated.

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Assuming your saying the browser dialog to enter your credentials is popping up. It sounds like there are some components of the page where the anonymous user (and possibly the user themselves) doesn’t have access to the file the page is trying to display. Sounds like the OWA directory has permissions that are preventing the page from being displayed correctly. One way to see if this is the case is to simply cancel the prompts… this will likely result in broken images or components on the page being displayed. If you see a 403 Forbidden error on the page, this is a sure sign permissions are the problem. IMHO it sounds like the first possibility is the culprit.

Buddyfarr also had some suggestions that may help below here.

are you going straight to the exchange server from your router or do you have a front end server first, then the exchange server. Some info I found on the same issue:

“What you need to know is that a front end server in exchange does not allow windows authentication (commonly known as pass through authentication). You have to set the front end to basic authentication. Then set the back end server to windows authenticaion and basic authentication.”

this was found here: <a href=”http://techrepublic.com.com/5208-6230-0.html?forumID=101&threadID=211384&messageID=2176611″>http://techrepublic.com.com/5208-6230-0.html?forumID=101&threadID=211384&messageID=2176611</a>

I hope this helps!. Also I found some references to checking your connection timeout settings for the inbound connections. If he opens the email and then clicks immediately on the attachment and it still asks for the credentials then the connection settings are probably not the problem.

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  • Russell0311
    can you tell me if you fixed this isue? I have an exchange front end load balanced pair of server Exchange 2003 and a backend cluster. i ahve the smae problem. Front end security is basic with an ssl certificate and the backend is integrated and basic. thanks Russell
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  • Prashant112151
    Hi ,, I am faicng simiar problem with same one, We are facing problem with OWA. whenever user accessing his OWA window then he able to login sucessfully but again and again asking for credetials even anywhere clicking then asking for credentials.
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  • Prashant112151
    please find work arround(may be this temp solution because i am unable to found RCA for same), 1) Get the all backup of mails and make the PST. 2) If your using secure certificate then download certificate and installed again in your trusted certificates. 3) then check his mail box.
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  • Mentalsolutions
    I have seen something like this before - if im not mistaken it has something to do with the version of office installed on the clients PC - something in OWA causes interaction with older versions of office
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  • Xvii172002
    I am having this problem before I fixed it Check Outlook settings: Properties  Email Account  Change  more settings exchange proxy settings 1. Check Connect using SSL only 2. Uncheck “Only connect to server that has principal name on their certificate” If the error still occurs check the registry Run regedt32.exe and access HKEY_LOCAL_MACHINESOFTWAREMicrosoftRpcClientProtocols Name Type Data (Default) REG_SZ (value not set) ncacn_http REG_SZ Rpcrt4.dll ncacn_ip_tcp REG_SZ Rpcrt4.dll ncacn_np REG_SZ Rpcrt4.dll ncacn_nb_tcp REG_SZ Rpcrt4.dll ncadg_ip_udp REG_SZ Rpcrt4.dll If one the values is missing , right click on the page and add new string value and input the name and type. Then right click on the value added and then modify and and then input the Data
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