If the client is unable to connect to the server, try running a browser on the client machine if that fails, on the server machine. If your server doesn't have a GUI, you can use a tool like wget to read a web page from a command line interface.

If you are able to connect to the server from the same machine, then there is probably a firewall preventing access to the server port from your original client machine. If you are not able to access the server from the same machine, then you will need to review the server logs for likely causes.