if ( this.firstResponse ) {
                if ( !this.mechContext.isSupported(targ.getMechanism()) ) {
                    throw new SmbException("Server chose an unsupported mechanism " + targ.getMechanism());
                }
                this.selectedMech = targ.getMechanism();
                if ( targ.getResult() == NegTokenTarg.REQUEST_MIC ) {
                    this.requireMic = true;