再次遇到了这个问题，大家知道一般MOSS的Web Application都需要有一个Application Pool，而且在Web Application里面也有几个地方会用到管理帐号。这个帐号一般是一个AD的帐号，而一般AD都有密码策略，规定密码必须多少时间修改一次。
很显然，如果密码被修改了，则可能导致MOSS的Web Application无法运行，具体的错误是一个503错误，意思是说服务不可用（Service Unavailable)
那么如何来解决该问题呢，请参考下面文章的介绍
http://support.microsoft.com/kb/934838/en-us/
我们一般可以通过一个脚本来快速实现这个功能
@echo off
rem other app pools
echo *** Updating app pool passwords
"%commonprogramfiles%\Microsoft Shared\Web server extensions\12\BIN\Stsadm.exe" -o updateaccountpassword -userlogin %1 -password %2 -noadmin
rem central admin
echo *** Updating Central Admin password
"%commonprogramfiles%\Microsoft Shared\Web server extensions\12\BIN\Stsadm.exe" -o updatefarmcredentials -userlogin %1 -password %2
rem ssp - new
echo *** Updating ssp password for new installs
"%commonprogramfiles%\Microsoft Shared\Web server extensions\12\BIN\Stsadm.exe" -o editssp -title "SharedServices1" -ssplogin %1 -ssppassword %2
rem ssp - upgrade
echo *** Updating ssp password for upgraded installs
"%commonprogramfiles%\Microsoft Shared\Web server extensions\12\BIN\Stsadm.exe" -o editssp -title "Default Web Site" -ssplogin %1 -ssppassword %2
rem osearch
echo *** Updating osearch password
"%commonprogramfiles%\Microsoft Shared\Web server extensions\12\BIN\Stsadm.exe" -o osearch -farmserviceaccount %1 -farmservicepassword %2
echo *** MANUAL UPDATE NEEDED. To update the password, visit the SSP Web application page, click Search Settings, and then click Default Content Access Account.
rem spsearch
echo *** Updating spsearch password
"%commonprogramfiles%\Microsoft Shared\Web server extensions\12\BIN\Stsadm.exe" -o spsearch -farmserviceaccount %1 -farmservicepassword %2
echo *** Updating spsearch content access account
"%commonprogramfiles%\Microsoft Shared\web server extensions\12\BIN\stsadm.exe" -o spsearch -farmcontentaccessaccount %1 -farmcontentaccesspassword %2
rem restarting IIS
echo *** Doing soft restart of IIS
iisreset /noforce
echo on