Some time ago I have installed new exchange server to new domain in my forest. Our environment consists of front end and back end that are divided in each domain. after installing new exchange back end, I tried to receive and send emails via outlook, and it succedd but when I try to login via webmail on front end, an error message appears: HTTP/1.1 503 Service Unavailable anyone can give me directions? thanks for your time and assistance

I just checked my administrative group on front end exchange system manager. when i clicked the storage group on my troubled exchange back end, it returned error: Operation: Retrieving mount information ID no: c1041721 Exchange system manager is my problem related with this error? its quite strange, since i could send and receive email via outlook, also via OWA on my back end but i couldnt login into OWA on my front end

Hi, For this issue, I suggest you follow these steps to troubleshoot the problem: 1. Do you have Front-end server in each domain, if you have, What is the URL you use to access OWA? 2. As Front-end servers do not support integrated Windows authentication (which includes both NTLM and Kerberos authentication) or HTTP 1.1 Digest authentication. So I suggest you follow this document to check the authentication on your Front-end Server. Here are the documents for you: Authentication Mechanisms for HTTP http://technet.microsoft.com/en-us/library/bb124839(EXCHG.65).aspx How to Configure Authentication on a Front-End Server http://technet.microsoft.com/en-us/library/aa998059(EXCHG.65).aspx 3. Has your front end server installed any anti-virus software ? if you have installed, please turn off it to have a try. 4. Please check the configuration in your DNS server. Here are some related articles for you, hope it helps: Hosting Multiple Domains http://technet.microsoft.com/en-us/library/bb123560(EXCHG.65).aspx 503-Service Unavailable (IIS 6.0) http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/55f71614-ef1b-4015-b9c8-a42c1e700c25.mspx?mfr=true You receive the "HTTP 1.1/ 503 Service is no longer available" error message when users try to access Exchange 2000 or Exchange Server 2003 public folders by using Outlook Web Access http://support.microsoft.com/kb/840182/en-us If the problem still persists, please feel free to let me know and I will be glad to help. Best Regards, Evan