If you find you cannot start either the install wizard, or the SSL-Explorer service when installed on a CentOS 5 server, please check the sslexplorer.log. If you get an error like the following:

[main] ERROR Main - Failed to start the server. The host nam
e or address on which this service is running could not be determined. Check you
 network configuration. One possible cause is a misconfigured 'hosts' file (e.g.
 on UNIX-like systems this would be /etc/hosts, on Windows XP it would be C:\Win
dows\System32\Drivers\Etc\Hosts).
java.lang.Exception: The host name or address on which this service is running c
ould not be determined. Check you network configuration. One possible cause is a
 misconfigured 'hosts' file (e.g. on UNIX-like systems this would be /etc/hosts,
 on Windows XP it would be C:\Windows\System32\Drivers\Etc\Hosts).
        at com.sslexplorer.server.Main.start(Unknown Source)
        at com.sslexplorer.server.Main.main(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at com.sslexplorer.boot.Bootstrap.start(Unknown Source)
        at com.sslexplorer.boot.Bootstrap.main(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)

then please do the following to resolve the issue:

 Edit /etc/sysconfig/network and enter a valid hostname in the HOSTNAME= section (defaults to localhost.localdomain, which doesn't work).