Hi,
Try this below steps.
To change the port used by the Endpoint Encryption Manager can use the Configuration Editor.
The Configuration Editor is placed on the SEE Management Server during installation.
To open the Configuration Editor go to the following installation folder :\Program Files\Symantec\Symantec Endpoint Encryption Management Server\Services\
Double click on the Symantec.Endpoint.Encryption.ConfigManager.exe to run it.
Click the Web Server Configuration tab.
Before you can modify the information contained within the Protocol area, you must provide the credentials of a user with administrative rights to IIS on the SEE Management Server.
Enter the user name in the IIS Administrator Name field and enter the password in the Password and Confirm Password fields.
Type the domain of this account or the local computer name.
You can also optionally provide the friendly server name of the SEE Management Server. This value is saved in the SEE database for future use.
Once you have completed the entry of the administrative credentials, to change the protocol itself, select the relevant option button. If HTTPS is selected, an SSL Port field will be displayed.
To change or set the TCP port that is used for client communications with the SEE Management Server, enter the appropriate number in the TCP Port field. An SSL port is also required for HTTPS communications.
When completed click OK to finish.
Points to note when you chaning the port or protocol:
1. The IIS Default website uses port 80, so it is probably best to either stop the Default website if it is not in use or else change the port to something other than port 80.
2. If you have already deployed you client packages to your clients they will NOT automatically be reconfigured to change to the new ports you will be required to redeploy a new package in order to re-establish communication.
http://www.symantec.com/business/support/index?page=content&id=TECH92450