I have installed with default settings of ArcGIS server 9.3.1 (without any service packs).
I was able to login with user id arcgismanager and pwd as arcgis.manager
I have changed the passwrod in the C:\Program Files\ArcGIS\java\manager\service\tomcat\managerappserver\conf folder
<user username="arcgismanager" password="arcgis.manager123" roles="admin,manager"/>
I restarted the arcgis manager, soc, soc monitor. Again i tried with new password, i was not able to login, but able to login with old arcgis.manager pwd.
I tried logout the machine, still the same problem.
let me know, what mistake i am making here.. any idea