GSSAPI, Kerberos log in

Hi, we use putty / plink successfully to log in via Kerberos. Putty knows two libraries:
* MIT Kerberos GSSAPI32.DLL
* Microsoft SSPI SECUR32.DLL

in winscp one can enable GSSAPI, but it does not work.

Please attach a log file both from WinSCP and PuTTY.