Problem while send message to Group chat

Smack Smack Dev
1

Hello,

I am using Group chat and sending message like this.

GroupChat newGroupChat = new GroupChat(XMPPConn, bulletinTopicText + "@vpn.entquest.com");

newGroupChat.join(“502”);

                XMPPConn.getRoster().createEntry("501@vpn.entquest.com", "Chetan", new String[] { bulletinTopicText});

                XMPPConn.getRoster().createEntry("503@vpn.entquest.com", "Maneesh", new String[] { bulletinTopicText });

newGroupChat.sendMessage(“hi!”);

but here its not working properly. When I join method its give exception : No response from server.:

Help me to solve this issue…

Thanks