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

I use SFTP and FTP.

What protocol are you using with servers that fail to abort the connection attempt?

Version is 5.19. But this problem is with all versions, for a long time.
But at the same time this problem does not occur in all cases. On some servers there are no problems.

What version of WinSCP are you using?

if it worked :)
Close button hangs up all the process, and does not stop try to connect, does not close window. After click, I still have to wait..

You can cancel that anytime by pressing the X button.

I mean this:

What "request" do you mean?

Hello! 5 seconds for timeout is too big. I have several local virtual machines, and when some vm is turned off, and i opened it in WinSCP by mistake, i have to wait too long before i can cancel request.
Also, sometimes timeout is not working, and at 5 seconds a have to wait much longer.