help in apps 11.5.3, getting an error

hi uday and the rest,
i installed oracle apps 11.5.3. My hostname is surya, domainname for the sun server is tafin.com (we dont have a domain, its a private network)

if i type http://surya:8002/dev60cgi/f60cgi, i get a log on screen and if i connect, i see the responsibilities screen. this is a vision database.

If i select anything like system administration from the responsibilities , i get an error, FRM-92100: your connection to the server was interupted. this may be the result of a network error or failure on server. You will need to restablish your session.

pls let me know what to do and what to check ?

thanks