Question : iPhone/Exchange "authentication reluctance".

Exchange mail high dependency user's iphone user reports wi-fi password changed at relatives home. User changes password to access relative's wi-fi - all is good. User then gets the following message on the iPhone; "Please Enter password for Exchange email". He does but it would not recognize his password for exchange email. User leaves relatives home to return to his own wi-fi system at his home.  When he tries to authenticate, he got; "The User name or password for "Exchange" is incorrect" (which may have been true for password). User believes relative's wi-fi somehow caused this blockage. However, the user also saw similar behavior with his iPhone last Thursday while away from the office.  User finally reset his iPhone and was able to successfully authenticate.  User would like to know why this happened so any thoughts/speculations welcome.

Footnotes:

1) the user had about four different devices (2 laptops, an iPad and an iPhone), accessing the Exchange server at different times last week.

2) I noticed similar problems with my own iPhone last week - briefly - a sort of "authentication reluctance" between the device and the server.

3) At least 18 other users have reported no problems.

Answer : iPhone/Exchange "authentication reluctance".

More than likely it might have been a connectivity issue.  Did you check to see if the user account locked out during the time they couldn't access exchange? If the user experiences a problem you might just want to advise them to temporarily disable Wi-Fi.