Try http:\\localhost:<TCP port number for SEPM website>\Reporting
In there if you are getting the same error "Bad gateway - The server received an invalid response from another server while attempting to fulfill the request" then you can follow the steps given below:-
If you use the Symantec Endpoint Protection Manager console on the Windows Server 2003 operating system with Internet Information Services (IIS) 6.0 installed, you may want to install Microsoft's FastCGI Extension for Internet Information Services 6.0.
For your convenience, the following FastCGI extensions are located in this folder:
■ fcgisetup32.msi, for use on 32-bit computers
■ fcgisetup64.msi, for use on 64-bit computers
For more information about FastCGI, see the information available at the following URL:
http://www.iis.net/fastcgi/phpon60
Run the setup for fcgisetupXX.msi on the computer on which you have Symantec endpoint protection installed.
FCGISETUP32.msi is available in CD2 or you can download that same from
http://www.microsoft.com/downloads/details.aspx?FamilyID=2d481579-9a7c-4632-b6e6-dee9097f9dc5&displaylang=en
FCGISETUP32.msi for 32 Bit server
FCGISETUP64.msi for 64 Bit server
After the installation is done navigate to C:\Windows\System32\inetsrv
Open fcgiext.ini with a text editor.
Add the following lines to the bottom of the file:
Note :- <Drive> denotes the drive on which your Symantec Endpoint protection manager is installed. e.g c: or d:
php=PHP
[PHP]
ExePath=<Drive>:\Program Files\Symantec\Symantec Endpoint Protection Manager\PHP\php-cgi.exe
Arguments=-c "<Drive>:\Program Files\Symantec\Symantec Endpoint Protection Manager\Php\php.ini"
InstanceMaxRequests=10000
EnvironmentVars=PHP_FCGI_MAX_REQUESTS:10000
Save the changes to the file.
Now navigate to <drive>:\Program Files\Symantec\Symantec Endpoint Protection Manager\Php\php.ini
Right click on php.ini and uncheck "Read only" and click on OK. Then open the file and add the following lines to the bottom of the file:
fastcgi.impersonate=1
fastcgi.log=0
Save the changes to the file and close it. Again open properties php.ini and check the "Read only" box and click on OK.
Click Start>Control Panel>Administrative Tools>Internet Information Services (IIS) Manager
In the navigation tree, under Web Sites, under Default Web Site, right-click Reporting, and then select Properties.
On the Virtual Directory tab, click Configuration. On the Mappings tab, under Application extensions, click the executable path, for the extension .php and then click Edit.
Change the path to C:\windows\system32\inetsrv\fcgiext.dll
Or %WINDIR%\system32\inetsrv\fcgiext.dll
Where you replace %WINDIR% with the definition of %WINDIR% on your computer.
Hope that should work for you..