My office in Malaysia able to access MS exchange that is located in US. My office is working perfectly with MS exchange. However, some users on the run and home office users not able to establish connection to Exchange server. During the outlook setup, I am not able to get authenticated.
I did some common connection test like ping , nslookup, online port scan, and etc.
I even tried with https proxy, however, no good.
I saw an MS acticle about Cox communication block port 135-139, is there a work-arround ? bypass ? port mapping ?