WinSCP process terminated with exit code 3

We've been using WinSCP through a .NET connector in Dynamics NAV BC for a few years now for automated processes but a few weeks ago I started receiving this error below. I found some older messages on this in the Bug 996 tracker thread and tried upgrading to the latest version but it did not help. Restarting our server corrects it for a few days but it always seems to return.

I've attached the debug log.

Error Message:

Exception: WinSCP.SessionLocalException: WinSCP process terminated with exit code 3. There was no output. Response log file C:\Users\{username}\AppData\Local\Temp\wscp235C.01A8D5D7.tmp was not created. This could indicate lack of write permissions to the log folder or problems starting WinSCP itself.
at WinSCP.Session.Open(SessionOptions sessionOptions)

Please try 5.21 – stable version released yesterday.
While your old version might had have Bug 996, if you have upgraded to 5.19, you now might have:
Issue 2075 – Prevent occasional exhaustion of resources while testing WinSCP executable version on repeated use of .NET assembly

I did upgrade to 5.19.6. My old version was 5.7 I believe.

I'll give the new stable version a shot here...thanks.

I upgraded to 5.21 and let it run for about a week and have had no issues.

Thanks Martin!

Thanks for your feedback.

This is a known issue across all versions of WinSCP, and the only way to resolve is to reboot the server.

@Guest: Are you really having the problem even with the latest version of WinSCP? Can you post a log file?

Hello Ritchi,

Did upgrading to WinSCP 5.21 helped?

Thanks, Krishanu

Hello There,

I have the same error on version 5.21.6

WinSCP.SessionLocalException: WinSCP process terminated with exit code 3. There was no output. Response log file C:\Users\SVC_SCONSOLE\AppData\Local\Temp\wscp0FC0.02C8B46A.tmp was not created. This could indicate lack of write permissions to the log folder or problems starting WinSCP itself.
à WinSCP.Session.Open(SessionOptions sessionOptions)

WinSCP works normaly during several hours and, suddently i dont know why it stop working. Restarting my app permit to re work normally for several hours and the problem occurs again..
My app is opening two new sftp sessions every 5 minutes (and close and dispose them after usage)

@ValentinT: Please post debug file from the last session that works (and its session log) and the first session that does not. Also, did you check memory consumption (overal and of your application), when it stops working? Isn't there some leak? Did you check running processes, if there are some pending winscp.exe processes?