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Remote Desktop Service suddenly stopped working and displays error

Hi Folks,
I can RDP to my TS server from within the local Network, but from the internet, I get the following error messages.

I am not sure what it could be and could only suspect that my ISP has done something to the public IP address, though a ping to that server (FQDN) still returns the correct IP.

Please see attached screenshot.
Thank you
RDP-error.jpg

celazkon

can you connect to the public IP with telnet or any other similar app (netcat etc.) on port 3389?

Kennyboy5

Do you have a vpn running before RDPing?

KB5

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netballi

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lords1979

What AV are you running? I know by default Kaspersky allows RDP from the local network but will block from any other network.

Gospodin Rasputin

ASKER

A telnet to the TCP port fails

I get the following error message when I telnet. "Connection closed by Remote Host"

I am using Sophos anti-virus and it has always worked until lastw weekend

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netballi

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SOLUTION

celazkon

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Gospodin Rasputin

ASKER

Thanks to everyone.
The problem was that the domain had been transferred to another ISP who incorrectly amended the DNS records with the wrong IP.

So when I telneted, I was actually telnetting to the incorrect IP. A telnet to the correct IP works. I shall share the points thus.

Gospodin Rasputin

ASKER

The error was caused by a change in DNS settings at the ISP, but the comments provided by the Experts helped me troubleshoot.