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Could not open connection to the host, on port 23: connect failed.

Posted on 2011-09-27
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Last Modified: 2012-05-12
I am using telnet from my client (192.168.70.21) to connect with my server (192.168.70.20).

I go this error message.  Can anyone tell me what might go wrong?
Capture4.JPG
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Question by:tommym121
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Author Comment

by:tommym121
ID: 36714137
Sorry. I miss to send other images Inbound rule for Firewall on ServerCapture2.JPG
Capture3.JPG
Capture5.JPG
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expone earned 500 total points
ID: 36714312
This means that either your server (192.168.70.20) doesn't have a Telnet Server process running on port 23, so it is not accepting your telnet connection (from 192.168.70.21), or your firewall is not allowing traffic on port 23.

Try disabling your firewall temporarily and then test telnet. If it works, then you need to tweek the firewall. If it still doesn't work, then you need to check whether your server is running the telnet server.
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Author Comment

by:tommym121
ID: 36714353
The Telnet Server (Tlntsvr.exe) is running.

If I change the inbound connections: from Block (default) to Allow in the Domain Profile Tab of Windows Firewall with Advanced Security Properties,  Telnet works.

What I don't understand is that if my inbound rule for telnet is enable, why I nned to turn the inbound connections to be Allow
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LVL 6

Assisted Solution

by:expone
expone earned 500 total points
ID: 36714367
You need to allow the inbound connections on port 23, so that Telnet Server (from outside your PC) can talk to the Telnet Client (which is inside your PC, hence the need for the inbound rule).
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Author Comment

by:tommym121
ID: 36714436
But if you look at the screen capture (capture1) -  Inbound rule for Firewall on Server.

Does it indicate the Telnet inbound Rule is enable with port 23 for the my server?
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by:expone
expone earned 500 total points
ID: 36715764
Yes,  "capture1" above indicates that Telnet inbound Rule is enabled for port 23 on your server. This will allow the server to accept inbound telnet connections on port 23 from your PC.
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Author Comment

by:tommym121
ID: 36716096
But with that configuration, I still have the error.  That is why I am not sure what I miss?
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Author Comment

by:tommym121
ID: 36716538
And if you look at the  firewall logfile, it actually dropping the telnet packet even I enable Telnet.

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Assisted Solution

by:expone
expone earned 500 total points
ID: 36719219
Different firewalls work different ways. The main thing is that you figured out how to make it work with turning the inbound connections to be Allowed.
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Author Comment

by:tommym121
ID: 36814983
I am using Firewall comes with Windows Server 2008 R2
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by:expone
expone earned 500 total points
ID: 36818321
Good on you mate :-)
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Author Closing Comment

by:tommym121
ID: 36956112
Thanks for your effort
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