ServerMessageBlock response ) throws SmbException {
synchronized (session.transport()) {
        if( response != null ) {
            response.received = false;
        }
        treeConnect( request, response );
        if( request == null || (response != null && response.received )) {
            return;
        }
        if( service.equals( "A:" ) == false ) {
            switch( request.command ) {

                    "  Skipping DC interrogation." );
        } else {
            SmbSession ssn = trans.getSmbSession( NtlmPasswordAuthentication.DEFAULT );
            ssn.getSmbTree( LOGON_SHARE, null ).treeConnect( null, null );
        }
        return new NtlmChallenge( trans.server.encryptionKey, dc );
    }
    public static NtlmChallenge getChallengeForDomain()
                throws SmbException, UnknownHostException {

            T chainedResponse = null;
            if ( ! ( request instanceof SmbComTreeDisconnect ) && ! ( request instanceof Smb2TreeDisconnectRequest ) ) {
                chainedResponse = treeConnect(request, response);
            }
            if ( request == null || ( chainedResponse != null && chainedResponse.isReceived() ) ) {
                return chainedResponse;
            }

            t.markDomainDfs();
        }

        try {
            if ( log.isTraceEnabled() ) {
                log.trace("doConnect: " + addr);
            }
            t.treeConnect(null, null);
            return t.acquire();
        }
        catch ( SmbAuthException sae ) {
            log.debug("Authentication failed", sae);

        if ( logonShare == null || logonShare.isEmpty() ) {
            throw new SmbException("Logon share is not defined");
        }
        try ( SmbTreeImpl t = getSmbTree(logonShare, null) ) {
            t.treeConnect(null, null);
        }
        catch ( CIFSException e ) {
            throw SmbException.wrap(e);
        }
    }


    boolean isSignatureSetupRequired () throws SmbException {

        if (tree.inDomainDfs) {
            tree.connectionState = 2;
        }

        try {
            if( log.level >= 3 )
                log.println( "doConnect: " + addr );

            tree.treeConnect(null, null);
        } catch (SmbAuthException sae) {
            NtlmPasswordAuthentication a;
            SmbSession ssn;

            if (share == null) { // IPC$ - try "anonymous" credentials

                // referrals.
                try ( SmbTreeHandleImpl th = ensureTreeConnected() ) {
                    if ( this.fileLocator.getType() == TYPE_SHARE ) {
                        // treeConnect is good enough, but we need to do this after resolving DFS
                        try ( SmbTreeHandleImpl th2 = ensureTreeConnected() ) {}
                    }
                    else {