Exception has been configure on the server, how to know that it work or not?

See below articles

How to Verify if an Endpoint Client has Automatically Excluded an Application or Directory

See this thread also

http://www.symantec.com/connect/forums/verify-all-exceptions-endpoint-client-are-applied

Check the thread

https://www-secure.symantec.com/connect/forums/verify-central-exclusion-policy-applying-end-point-clients

Hello Raney,

since you have already configured exceptions the best thing to do is to download a test virus on these folders and try to access it inside these folders.

http://www.symantec.com/security_response/attacksignatures/detail.jsp?asid=24461

Eicar is a test virus its used to check if your AV is working or not, it wont do any harm. Its just a test file

download the file from 

 http://www.eicar.org/anti_virus_test_file.htm

place it in the excluded folder, rigth click on the folder and select scan. the folder should come clean, if it finds it then symantec is acting on that folder

1. Start > Run > Regedit
    
2. Browse to the registry key:
   • HKEY_LOCAL_MACHINE\SOFTWARE\SYMANTEC\SYMANTEC ENDPOINT PROTECTION\AV\EXCLUSIONS
     Note: On 64bit window machines the registry path is:
     HKEY_LOCAL_MACHINE\Software\WOW6432Node\Symantec\Symantec Endpoint Protection\AV\Exclusions
      
3. Expand the key to view the various applications listed there.
   • The 'File Exceptions' folder is where you can inspect the full list of exclusions associated with that product.

This key is where both automatic and policy added exclusions are stored on the client. Inspecting this key reveals all exclusions applied to the client. If you do not see the exclusion you are trying to add listed in the registry, then it is not being added automatically. You must manually add it to a Centralized Exceptions policy.