Hi Bernd,
wild guess: port 778 is < 1024 and thus restricted to admin/root
access by many operating systems.
Maybe you give port 7778 a try?
Have fun,
Heiner
Bernd Rücker wrote:
> Hi all.
>
>
>
> I have a problem with Jsch for remote port forwarding. I set up a
> connection without problems. Local port forwarding works as well.
>
>
>
> But when using remote port forwarding:
>
> session.setPortForwardingR(778, "localhost", 3306);
>
>
>
> I get an exception:
>
> Caused by: _com.jcraft.jsch.JSchException_: remote port forwarding
> failed for listen port 778
>
> at com.jcraft.jsch.Session.setPortForwarding(_Session.java:1658_)
>
> at com.jcraft.jsch.Session.setPortForwardingR(_Session.java:1597_)
>
> at com.jcraft.jsch.Session.setPortForwardingR(_Session.java:1587_)
>
> at
> com.camunda.bpp.gatekeeper.agents.SshAgent.start(_SshAgent.java:47_)
>
>
>
> Anybody any idea?
>
>
>
> When I use remote port forwarding via Putty or another SSH client, it
> works fine, so it must be a problem with Jsch. Any help would be
> appreciated!
>
>
>
> By the way, the Exception is thrown because of a reply=0 (whatever that
> means?):
>
>
>
> private void setPortForwarding(String bind_address, int rport) throws
> JSchException{
>
> synchronized(grr){
>
> Buffer buf=new Buffer(100); // ??
>
> Packet packet=new Packet(buf);
>
>
>
> String address_to_bind=ChannelForwardedTCPIP.normalize(bind_address);
>
>
>
> try{
>
> // byte SSH_MSG_GLOBAL_REQUEST 80
>
> // string "tcpip-forward"
>
> // boolean want_reply
>
> // string address_to_bind
>
> // uint32 port number to bind
>
> packet.reset();
>
> buf.putByte((byte) SSH_MSG_GLOBAL_REQUEST);
>
> buf.putString("tcpip-forward".getBytes());
>
> // buf.putByte((byte)0);
>
> buf.putByte((byte)1);
>
> buf.putString(address_to_bind.getBytes());
>
> buf.putInt(rport);
>
> write(packet);
>
> }
>
> catch(Exception e){
>
> if(e instanceof Throwable)
>
> throw new JSchException(e.toString(), (Throwable)e);
>
> throw new JSchException(e.toString());
>
> }
>
>
>
> grr.setThread(Thread.currentThread());
>
> try{ Thread.sleep(10000);}
>
> catch(Exception e){
>
> }
>
> int reply=grr.getReply();
>
> grr.setThread(null);
>
> if(reply==0){
>
> throw new JSchException("remote port forwarding failed for listen
> port "+rport);
>
> }
>
> }
>
> }
>
>
>
> Cheers
>
> Bernd
>
>
>
>
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>
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