Thank you for your replay wrobinson,
Yes, OWA works, even from my home using PPTP
. We actually have 8 sites that are going to use that exchange server, 7 of them have the netscreen in our side . The 8th one has a CIsco ASA managed by them, this one works but athe difference is that in that site we get the DHCP from the router because there is no server there Yet. AT the begining we have the same problem in that site but then they added another DNS server and it worked. I think we have a DNS problem but I can’t find out what is wrong yet.