XMPP connection to OpenFire server

I'm trying to connect to the open fire server, the server ip is 50.18.175.235 but I'm unable to connect it, and where as I tried with the google talk server name it works fine and also I tried with the local server obaid.macbook.local it works fine but I'm unable to connect it to the open fire.

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence {

// a buddy went offline/online

NSString *presenceType = [presence type]; // online/offline
NSString *myUsername = [[sender myJID] user];
NSString *presenceFromUser = [[presence from] user];

if (![presenceFromUser isEqualToString:myUsername]) {

if ([presenceType isEqualToString:@"available"]) {

[_chatDelegate newBuddyOnline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"50.18.175.235"]];

} else if ([presenceType isEqualToString:@"unavailable"]) {

[_chatDelegate buddyWentOffline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"50.18.175.235"]];

}

}
}

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