I have created an internal network which includes the latest Openfire Jabber Server (3.6.4).  I have multiple Spark clients that can log in based on the IP address of the server and a username.  With Spark clients I have no issue when using IP address.  When using my Iphone and your latest build that I downloaded at 6pm EST, I cannot connect to Openfire.  Example of my settings:  Jabber-id=iphone pwd=pwd server=192.168.1.100 port=5222

iphone is not a jabber id.
A jabber id if of the form .(JavaScript must be enabled to view this email address).

I do not know what is the domain of your server. Maybe your admin used the IP as domain. You can try .(JavaScript must be enabled to view this email address) as Jabber ID.
Otherwise, ask the admin what is the domain of your server.

Mickael,
Thanks for the post.  I set the laptop up myself.  I have my domain, but guess I am getting confused why I need that.  If this is on my internal network, with no external Internet access, can I not use the IP?  With the Spark client, it uses username=iphone and pwd=pwd.  I do not have my own DNS running and I do not think I can update a “hosts” file on my Iphone.  My goal is to have my application activate a message based on certain criteria.  Setup is as follows:  Laptop connected to hub.  Static IP 192.168.0.200.  Access Point connected to the same hub.  Iphone connected to Access Point with a static IP of 192.168.0.100.  I have successfully pinged from laptop to iphone.  Cheers.  Chris

A domain is always need for XMPP. That’s part of the protocol. Even if you use only a single server.
It does not means however that it has to be registered in DNS.
You can use .(JavaScript must be enabled to view this email address) to connect and use IP to define on which host to connect to.

Did you try putting .(JavaScript must be enabled to view this email address) as Jabber id and your IP in server. As OpenFire does not support virtual hosting, I guess you can put anything as domain basically and he will accept it.