 Re: gateway is not responding
One good way to start is to identify what changed 3 weeks ago. Are you sure the conditions under which you tested were exactly the same, like user, version, etc?
Another angle is to try and understand what is shared by the user that can't authenticate and what differs from the ones that can. If it's only the lines, are they all from the same provider? Is it possible that they decided to block ESP? It's definitely worth it giving them a call and asking. |