Please post only if you are willing to really help me debugging the problem. Otherwise, there's no point in posting "me too".

@payal.parikh: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

I have upgraded my version to 5.21.8. I tried blackout the version and still its not working.

@dteller: For me there were some versions working and some not working. I am not sure if it was caused by Windows version or WinSCP version. In actual combination it works (WinSCP 5.15.4, Windows 10 1809 build 17763.805)

@dteller: Manually set the port to 51000 it works.
If hit "SSH warring: Authorized users only. All activity may be monitored and reported" press continue next!

Hey,

I started getting this problem after updating my Windows version to 1809.
The solutions listed here involve manually changing the port. How can I do that?
And is there no better solution to this?

Thanks

Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

I've tried versions 5.15, 5.15.1 and 5.13.9
Windows 10 version 1809 build 17763.437

The error is

Cannot find free local listening port number for tunnel in range 50000 to 50099.

When I look in TCPView, there aren't actually any ports used in that range.

If I set the port manually to 49999 (which is free) I get

Network error: Connection "127.0.0.1" refused.

I also tried running it as an Administrator.

If I manually set the port to 51000 it works.

@curvers: Thanks for your report.
For me it works fine with the same setup.

Anyway, I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Same problem here using latest WinSCP version 5.15.1
OS Name Microsoft Windows 10 Pro
Version 10.0.17763 Build 17763

I did not have the problem before.
Few days ago I upgraded from Windows Home to Windows Pro, so maybe its related to this issue.

@eactors: Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

I still have the same problem running 5.13.8.
The problem was gone some times and is back now. I tried a full reboot of Windows 10 but it did not help (shutdown /g /f /t 0).

For me, update to WinSCP 5.13.7 helped.

@ApolloX: Thanks for your report.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

Changing the port range in Windows worked. Kind of a pain but at least it's gone.

@fab_33: I have tried to change port range, but it does not helped. I will try the debug version of WinSCP.

I'm having the exact same problem. Have had to manually go into each connection and set a random port for the past month or so.

@fab_33: I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.

Perhaps this problem (I have same problem since few month) is related to:
https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/default-dynamic-port-range-tcpip-chang

I'm not Administrator of my Windows computer so I can't try with changing the port range.

Thanks for your report.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

See attached screenshot

Unfortunately I didn't save session log before rolling back to 1803.
But I remember when I selected some port (ex. 50002) it said something similar to: "Can't connect to 127.0.0.1"

It works for me.

Can you post a session log file?

Does it work, if you select another local port in session settings?
https://winscp.net/eng/docs/ui_login_tunnel

Hello,
WinSCP's "Connect through SSH tunnel" feature stopped working after Windows 10 1809 update.
It says:

Cannot find free local listening port number for tunnel in range 50000 to 50099

I rolled back to 1803 version and WinSCP works again.

Best regards,
Igor