updating local clients from local GUP client

We have only one SEP 11.0 server for all the clients,  but client updations are not working from Group Update Providers. SEP server is installed at our head office and plant is connected to head office by RF link.

 

These polices were working fine if we update clients through main SEP server, but clients are not Updating through Group Update Provider. Telnet is wokring on Server & GUP

 

I also unable to telnet 2967 Group Update Provider port from any client.

 

Please Suggest me a way to solve this problem.