Endpoint Protection

Hi,
  I wonder if anyone has seen this issue before.  I've seen several posts which are similar to this problem but none of the solutions worked for me.  I log into my AV server and fire up Symantec Endpoint Protection Manager 11.  The SEPM login screen appears so I specify my credentials and log in.  The application begins to load, according to the progress bars, the application is thinking about it and the page briefly appears with the buttons for Home, Monitors, Reports etc.  They then disappear and the login screen is back.  I have tried resetting my password with Passwordreset.bat, I have checked my credentials for the sem5 database, tested the connection, reset IIS, added users to the permissions on IIS and moved the 8443 port up to 8444 and 8014 up to 8015 in conf.properties in case of a conflict with Symantec Backup Exec.  I have also run repairs on SEPM in Add/Remove Programs and used the Management Server Configuration wizard to change the ports.  I'm currently running a scan using the MS Malicious Software Removal tool to check for malware.  The SEP icon shows up in the tray for some of the clients so hopefully they're still using autoprotect even if the Manager isn't running. 
In Reporting.log, I see ERROR 0001: IP address changed during session.  Login is invalidated but this error doesn't seem to be documented.  I've tested secars in the browser and it seems to be running. PHP is installed and I believe it's the version it should be.  When I try to run http://<servername>:8015/reporting/login/login.php
in the browser, a login screen appears, I give it the credentials and domain (appears to be 'Default'), hit OK and the page just goes blank and I get a page called LOGOUT_SPM with url - http://iobi-comms:8015/reporting/login/logoutSPM.php?ssc=1 in return.
I have also restarted the server and the relevent services.  The eventlogs don't point to anything in particular apart from an update using Symantec Antivirus Win64.msi (which I have recently moved but from what I can see this machine is a 32 bit machine, so I don't think the problem could be caused by this msi). The eventlogs also say that svchost.exe has been blocking applications as part of Tamper Protection (hence my virus scan), but none of them seem to relate to SEPM.
Can you tell me if there is something that i'm missing here?  I'm not even sure if a reinstall of the application would help since it doesn't seem to have worked for others so I'm hesitant to go down that route at the moment.

Many thanks in advance,
Justin Forde.

Check the below 2 articles

Title: 'The Symantec Endpoint Protection Manager console, begins login but immediately logs out to the Symantec Endpoint Protection Manager login window without any error message'
Web URL: http://service1.symantec.com/support/ent-security.nsf/docid/2008021816482148?Open&seg=ent

Title: 'SEPM login revert to login screen'
Web URL: http://service1.symantec.com/support/ent-security.nsf/docid/2008081302490248?Open&seg=ent

I had a simillar problem, i solved it doing the following, i saw that the SEPM and SEP client on the server where not the same version, so apparentlyi had a pending upgrade console.
What i did was to install latest version, MR6 right now. Upgrade the console and everthing was solved.
if you already have MR6 please reinstall on top.
hope this helps

if you are in RDP session; take a console session
mstsc / console

Check your host file; make sure you have not addded your computer ip; it should be localhost.

in the console page; check if you are able to log in using IP address of the server instread of localhost:8443 ( type IP:8443)

https://www-secure.symantec.com/connect/forums/sepm-returning-login-screen-after-loggin

Justin, check your permissions on the  %ALLUSERSPROFILE%\Application Data\Symantec\Symantec Endpoint Protection Manager\Php\temp folder

Make sure your Internet Guest Account has full control to the folder.  Alternatively, if you are using Windows Authentication to a SQL sercver, make sure the windows user you are authenticating with has full control.

I had similar issue, remove iisuser_<host> accout from guest group because my server guest account group was disabled. once I did that, I had no issue to access to SEPM from console or remote.