One of the users from my client side was using Salesforce1 app from his iOS device but now suddenly he is not able to do so. He saying that each time he enters the Username+Password , he is again prompted to do so. We had raised a Case with Salesforce and were informed that his login request are not reaching Salesforce servers. He has tried re-installation of APP , Reset, Power OFF-ON. but all in vain.
We had tried contacting our client helpdesk too to check that something from there servers should not restrict his request to go. But they also told that nothing is happening from there end.
Does anybody know what might be other reasons for the same ? And how to resolve the issue ?