What ports do we block?

Zen block the ports between 135-139 on UDP and TCP, at the outside of our gateway servers. 

This means traffic on these ports between our gateways, other Zen servers and the global Internet, would be blocked.

Why we block these ports?

These blocks are in place as Microsoft Software uses these to broadcast packets of information.

If these ports were not blocked, they could potentially add a large number of un-necessary traffic on our our network.

What do I do if I need to use these ports?

If you need to use these ports for an application e.g. a Microsoft service running between two sites, we advise you to configure VPN access between the sites. This would allow traffic on ports between the two sites.