Endpoint Protection Small Business Edition

Hi, We have a machine that has End Point Protection installed and has been able to access other machine on the network, but today cannot, when I disable End Point Protection it works? Any idea what could cause this? Thanks

The Network threat  protection ( Firewall) is  blocking the  ip addresses. Could you please  create a firewall rule  to allow the range 0f ip addresses, in your  network?

If it a managed client, you  can do it  from the  firewall policy, on your  SEPM console. If it  is unmanaged, kindly  click on options, under Network Threat protection, and  select  configure  firewall rules...

Click on Add, and  in Add firewall rule  window, select, allow this traffic..Select  hots, and  then select ip addresses, and then type the  range  of your  ip address. Click OK, and  OK.

SEP comes with its own firewall Network threat protection.
Either remove this feature from add/remove programs --Symantec Endpoint Protection---Change --Modify--Select Network threat protection--select to remove this feature

Next--Install finish--reboot

Or else configure firewall rules to allow port 
File and Print sharing ports
TCP 139, TCP 445, UDP 137, and UDP 138.

aslo verfiy

NTP--Change Settings

any update??