I enabled the Telnet Server feature in Windows 7 SP1, and after 20 reboots later and some pinging find it is simply not working. I cannot ping port 23.. but Windows Firewall says the Incoming connection for "Telnet" is open.. does anyone know any why to get this working? Thanks 🙂
Windows – Telnet Server on Windows 7 not working
telnetwindows 7
Related Solutions
Edit: Of course, it's never that simple. As you've observed, Microsoft's telnet doesn't respond to ^]
while waiting for a connection.
If you don't want to wait around, you only have two options:
Kill the telnet process (from another command shell or the task manager), or
Use another telnet client. PuTTY is a good choice, since it will launch as a separate window; even if you get the port wrong and the PuTTY window freezes, your command shell will be available to launch another instance with the correct port number.
Use the escape character (defaults to Ctrl+]
). This brings up a telnet prompt at which you can close or quit the connection.
> telnet
Welcome to Microsoft Telnet Client
Escape Character is 'CTRL+]'
Microsoft Telnet>
You can change this to nearly anything you like on your commandline by using the -e
flag:
C:\>telnet /?
telnet [-a][-e escape char][-f log file][-l user][-t term][host [port]]
[...]
-e Escape character to enter telnet client prompt.
[...]
C:\>telnet -e '
Welcome to Microsoft Telnet Client
Escape Character is '''
Microsoft Telnet>
Have you tried disabling the auto-tuning diagnostic in Windows 7?
netsh int tcp set global autotuninglevel=disabled
When the receive window autotuning feature is enabled, older routers, older firewalls, and older operating systems that are incompatible with the receive window autotuning feature may sometimes cause slow data transfer or a loss of connectivity.
The default auto-tuning level is "normal", and the possible settings for the above command are:
- disabled: uses a fixed value for the tcp receive window. Limits it to 64KB (limited at 65535).
- highlyrestricted: allows the receive window to grow beyond its default value, very conservatively
- restricted: somewhat restricted growth of the tcp receive window beyond its default value
- normal: default value, allows the receive window to grow to accommodate most conditions
- experimental: allows the receive window to grow to accommodate extreme scenarios (not recommended, it can degrade performance in common scenarios, only intended for research purposes. It enables RWIN values of over 16 MB)
Best Answer
For the sake of troubleshooting, it might not hurt to temporarily turn off the Windows firewall, then Avast (or any other antivirus.) Might not hurt to do this on both sides of the connection either.
Also keep in mind that you can't ping a port. Use
telnet 192.168.0.3
to connect to the telnet service. If that doesn't work, then telnet isn't working.Check to make sure the telnet service is running under
Control Panel, Administrative Tools, Services
.