Error getting name of current remote directory

Hello,
i´m trying to connect to another device over SCP and C#. I try it 5 times and at some time it works on first and on other time it works on 4. try. If it´s not connecting the exception will be written in a logfile.
Here the LogEntry:
Error getting name of current remote directory. ---> WinSCP.SessionRemoteException: Command "pwd"
failed with return code 0 and error message
-sh: groups: not found.

Why happens this sometimes and sometimes not?

Thank you for help

Please attach a full session log file showing the problem (using the latest version of WinSCP).

So, latest Version is used an logfile is attached.

Now, i know that the device which i would connecting with, isn´t supporting groups. How can i disable it in C#?

Obviously I need a log for a run that failed.
I do not think your problem is related to group command.

I have already posted a logfile where the connection doesn´t work.

OK, I didn't notice that the log includes multiple sessions (some failing some not) and that the error is in German.
Your server delays printing of error message for group command, what makes WinSCP confuse the error with output of following pwd command.
So you need to turn off Lookup user groups.
https://winscp.net/eng/docs/ui_login_scp#other_options
To turn it off from .NET assembly, see:
https://winscp.net/eng/docs/rawsettings

Thank you :D