IP can PING, but cannot connect. No firewall or access filter either. Any ideas?
A particular computer can PING, and trace route to a Data Center. However, the same computer cannot connect to any specific ports at that DC. For Ex: HTTP, FTP or SSH.
There is no firewall, or access filter for that IP range at the Data Center either.
I tried to send data packets via tcp transfer from the DC to the computer to no avail. But the DC can still PING and trace route to the computer too, and vice versa.
The DC is located in US, while the client computer is located in Singapore.
I've never run into such a situation where a server can be pinged, but cannot connect to any ports, with no firewalls or access filters are running.
Is it possible that the upstream has something in place? or possibly other causes?
Any help would be appreciated.
