how to know port is opened

[johnhelen]

Hello

I have a server using JBoss. I know that JBoss use port 1099 as defaut port for computer clients to access to EJBs in the server computer.

In my client application, I have

java.naming.provider.url=serverIP/1099

However, I think that my client application sometime cannot access to this port. The reason is that I have to turn off then turn on the server computer. After that, my client is able to access. It is realy funny!!!

Do you know a method to check this port (in the server computer) is open or not from the client computer ???

Thank you
johnhelen

[luc.texier]

you mean java.naming.provider.url=jnp://localhost:1099 i presume.

To check if a machine is listening on a given port, try telnet

eg, for a server 192.168.1.1 listening on port 1099
telnet 192.168.1.1 1099

[johnhelen]

Thank you
No, in my client application, I have

java.naming.provider.url=jnp://serverIP:1099 (not localhost as I will connect the client computer to a server that have a serverIP.