You can try doing the 'telnet' to the system wihtout the 5555, this may not work if the 'telnet' service is turned off. Maybe also try a 'telnet' to some different port
I know that on UNIX, you can check the /etc/services file to see what port is being used by various functions. For example, on my test HPUX system, in /etc/services
ftp 21/tcp # File Transfer Protocol (Control)
so
/home/bobc # telnet mysys6 21
Trying...
Connected to mysys6.atl.hp.com.
Escape character is '^]'.
220mysys6.atl.hp.com FTP server (Revision 1.1 Version wuftpd-2.6.1(PHNE_40380) Fri Dec 4 10:05:22 GMT 2009) ready.
If you get the same type of response as you do to port 5555, it is a OS issue, nothing we can configure with Data Protector
I guess there is something similiar in Windows, you would probably need to check Properties of Services to find the port number being used