This guide applies to version MR1, MR2,MR3 and later.
1.Get sylink.xml from server
a. for MR1 and MR2 only. Copy of the file Sylink.xml from the server from C:\Program Files\Symantec\Symantec Endpoint Protection Manager\data\outbox\agent\
b. for MR3 and later version. SEP console->clients->right click on the group you want to join the workstation to and choose "export communicaiton settings"->browse and save sylink.xml file
2. On the client computer , click Start > Run, type smc -stop, and click OK.
3. Copy the Sylink.xml into the C:\Program Files\Symantec\Symantec Endpoint Protection folder, and replace any existing Sylink.xml file.
4. Click Start > Run, type smc -start, and click OK.
For more details: