Hi Kemal,
*** ERROR => SncPEstablishContext()==SNCERR_GSSAPI [sncxxall.c 3551]
GSS-API(maj): No credentials were supplied
Unable to establish the security context
We can see the above error in the dev_rout, you need to generate the credentials for the user by which you have started the saprouter.
Run below command by user which is defined in NT SAP router service.
sapgenpse seclogin -p local.pse
Regards,
Anil