Here's an article on the basics of setting up a GUP

http://www.symantec.com/docs/TECH105005

Essentially, you need to apply your LiveUpdate policies so that your intenteded GUP knows it's a GUP,  your clients know which GUP to use, and that the ports are open.

#EDIT# A bit more background info on GUPs can be found below:

http://www.symantec.com/docs/TECH138828

Plus a useful article for troubleshooting GUPs here:

http://www.symantec.com/docs/TECH104539

Hi Dear- First of all you will check the port communication between client and Server(Port Number- 2967). Telnet the same if it working then pls ensure that the GUP system is in same folder where you have assigned the policy or not...!!

Gup will be require in same folder where GUP policy will be allocate

https://www-secure.symantec.com/connect/downloads/create-gup-symantec-can-help-conserve-bandwidth-clients-remote-location

How to create the GUP (Group Updater Provider)

Step1. Go to the Policies of that Group where that Systems are Stored in Symantec Console.

Step2. Click on Live Update Setting Policy 

Step3. Live Update Policy Screen Display. Choose the Server Setting 

Step4. There three option displays

a)                  Internal & External Live Update Setting

b)                 Group Updater Provider

c)                  Third Party Management

Step5. Check on the Use of Group Updater Provider. Now Group Updater Provider is Enable. Click on it.

Step6. Group Updater Provider Box Display.

Step7. Two options are available in Group Updater Provider

a)                  Group Updater Provider Selection for Clients.

b)                 Group Update Provider Setting

Step8. In the Group Updater Provider Selection for Clients, Two options Display Single Group Updater and Multiple Group Updater.

a)   Single Group Update Provider:A single Group Update Provider is a dedicated client computer that provides content for one or more groups of clients. A single Group Update Provider can be a client computer in any group. To configure a single Group Update Provider, you specify the IP address or host name of the client computer that you want to designate as the Group Update Provider.

b)  Multiple Group Update Provider: Multiple Group Update Providers use a set of rules, or criteria, to elect themselves to serve groups of clients across subnets. To configure multiple Group Update Providers, you specify the criteria that client computers must meet to qualify as a Group Update Provider. If a client computer meets the criteria, the Symantec Endpoint Protection Manager adds the client to its list of Group Update Providers. Symantec Endpoint Protection Manager then makes the list available to all the clients in your network. Clients check the list and choose the Group Update Provider that is located in their subnet. You can also configure a single, dedicated Group Update Provider to distribute content to clients when the local Group Update Provider is not available.

Step9. Choose Single Group Update Provider / Multiple Group Update Providers as per required and Update the Hostname/IP of Group Updater System.

Step10. Click Ok.

have u tried attach?
Ur issue is sorted ya still pending

Please check the port 2967 and 8014 is opened bidirectional

Regards