glassfish server not starting

[rahul vishwakarma]

hi to all, I am building a small project in which i need to  use server of glassfish in centos 6.10, and java netbeans client in another centos 7 both in VM. now when i added server in netbeans by services->server ->add server and after filling information as :

DAS port : 4848 , http port : 8080, host : serverora.db.net, user : admin , password : ****, close. and  even after that start option is disabled.

i can't start server. start option is disabled.

there is one more problem. When i added server as localhost it started but asks for valid administrative credentials. i passed admin and password of glassfish server. But here again this is not accepting. What user name and password should i provide.

[Tim Holloway]

Use netstat to see if port 4848 is in use. Only one application can listen to a port at a time, so if there's another glassfish already running - or for that matter, anything listening on 4848 - then you'd have a conflict.