Hi,
We had a very similar issue (see below the sapgui trace) with NW SSO 2.0.
@Luciano, did you solve it ?
*** ERROR => SncPEstablishContext() failed for target='p:CN=XXXXX@yyyyyy.com' [sncxxall.c 3379]
*** ERROR => SncPEstablishContext()==SNCERR_GSSAPI [sncxxall.c 3345]
GSS-API(maj): No credentials were supplied
Unable to establish the security context
target="p:CN=XXXXX@yyyyyy.com"
<<- SncProcessOutput()==SNCERR_GSSAPI
*** ERROR => TmIWrite: SncProcessOutput (SNCERR_GSSAPI) [dpxxtm.c 1782]
*** ERROR => TmIConnect: TmIWrite [dpxxtm.c 948