authentication - xmppframework (iOS) receives didNotAuthenticate even the username and password are provided and correct -

i'm working on strange issue regarding xmpp authentication.

the problem face that, didnotauthenticate called though username , password provided correct.

as per enterprise requirement, user name , password stored locally in ios app. thus, confirmed not entered incorrectly, , have no change on server side.

while ios app running usual, method (xmppstream:didnotauthenticate:) called.

my guess while app running on 3g network, connection lossy, , app reconnected. seems case has higher chance if connection bad.

i'm not able reproduce error. has faces similar case before or can provide me guidance on debugging?

environment:

• openfire server 3.7.1
• xmppframework ios (3rd version)
• iphone 4s (ios 6.0.1)