503 Service Unavailable Error - Microsoft Exchange

Here is an article on how to tourbleshoot these errors:
How to troubleshoot the "503 Service Unavailable" error message:
http://support.microsoft.com/support.../q823/1/59.asp
I hoe this helps.

Robert Lampkin, MCSE: Messaging
Microsoft Exchange Support
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| From: "MCGM" <mcgm_irw@vsnl.net>
| Subject: 503 Service Unavailable Error
| Date: Mon, 31 May 2004 13:09:15 +0530
| Lines: 18
| X-Priority: 3
| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 6.00.2800.1409
| X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409
| Message-ID: <uXIqpMuREHA.3012@tk2msftngp13.phx.gbl>
| Newsgroups: microsoft.public.exchange2000.connectivity
| NNTP-Posting-Host: 203.94.232.230
| Path:
cpmsftngxa10.phx.gbl!TK2MSFTNGXA01.phx.gbl!TK2MSFTNGP08.phx.gbl!tk2msftngp13
..phx.gbl
| Xref: cpmsftngxa10.phx.gbl
microsoft.public.exchange2000.connectivity:17961
| X-Tomcat-NG: microsoft.public.exchange2000.connectivity
|
| Exchange 2K (sp3) on Win2K (sp4) running fine after enabling anonymous
| access. Posted a question to enable changing passwords through OWA. Lieff
| Pederson posted a URL and I tried implementing it.
|
| Created iisadmpwd as stated, issued "adsutil.vbs set
| w3svc/1/ChangePasswordFlags 1 (no SSL, since I dont have a certificate and
| am not qualified enough to deploy SSL).
|
| What I get now is a "HTTP 1.1 / 503 service unavailable error". Now I'm in
| DEEP trouble... Please help ...
|
|
| ---
| Outgoing mail is certified Virus Free.
| Checked by AVG anti-virus system (http://www.grisoft.com).
| Version: 6.0.659 / Virus Database: 423 - Release Date: 4/15/2004
|
|
|

your Web server is currently unable. web site's server is simply not available at the moment
HTTP Error is 503. if your server is in maintenance than your will be error 503. if you have more