Failed to connect to the Liveupdate Server

Hi,

We are getting LU error "Failed to connet to the Liveupdate error". In LU policy, we have selected only SEPM server and Symantec Iiveupdate server. SEP Client and SEPM server both are in same office but in different subnets but SEP Client is not downloading the latest virus definitions

SEP Version : 14.2 RU1 both Client and SEPM

Any suggestion please.

Regards

Sharma