Note: This was originally posted by an inactive account. Content was preserved by moving under an admin account.
Originally posted by: ejonesI recently installed LAE in a RedHat virtual server and ran into exactly this situation. (So, this is after figuring out how to connect to the RedHat server with PuTTY and after starting LAE which you've evidently gotten past)
It turned out that by default in RedHat there is a firewall set up and blocking all but a few ports, which meant that port 7721 is blocked and I had to unblock it. So here are my notes on how to deal with this.
The firewall is configured in the file named /etc/sysconfig/iptables
Modify the file with a user that has root privileges and enter the following line near the line that opens up the SSL port 22.
-A INPUT -m state --state NEW -m tcp -p tcp --dport 7721 -j ACCEPT
Then refresh the firewall settings with the command:
service iptables restart
To verify that the port is open you can enter this command:
iptables -L -n
The output should contain a line similar to the following:
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:7721
To see the LAE server process id and the port it is using enter the this command:
netstat -tulpn
A line in the output shown below indicates that the LAE server process identified by id 5119 is using TCP port 7721.
tcp 0 0 :::7721 :::* LISTEN 5119/java
I hope this helps.