Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

This morning when I opened my mail client I got a message saying that the identity of could not be verified.

I tried searching for information about this but I haven't found any. Any idea what this could be?

share|improve this question
up vote 1 down vote accepted

That server name is the one that is hosting your mailbox on Microsoft's servers (this is part of their Office 365 platform, which I believe also powers Hotmail and email). The message you're receiving indicates that the server you connected to (ostensibly presented a certificate that doesn't match its domain name, or presented a certificate that isn't trusted by your computer.

I believe that message box has a "Show certificate" option. Inspect the domain name on the certificate, that could give you a hint as to what is happening.

This could be caused by a number of things:

  1. If you connect to a public wi-fi network that requires you to click "I agree" in the browser before accessing any other web pages, then may have been redirected to the wi-fi provider's server before you had a chance to do that. Since that server isn't a Microsoft server, it can't present the right certificate.

  2. Your DNS names aren't resolving properly for a benign reason. Perhaps try using a well-known public DNS server such as Google Public DNS ( and or OpenDNS ( and If you allow the connection, your mail program could send your email password to the wrong server, where it will probably just be ignored.

  3. An attacker is redirecting your connection to their own server. Since they don't have a valid certificate, you get a warning message. If you allow the connection anyway, your mail program will send your password to the attacker's server where he could save it for malicious use.

  4. Microsoft's server isn't presenting a valid certificate. I think this is fairly unlikely.

share|improve this answer
Thanks, I know what it means when a certificate is not valid, I just wanted to know what that server is :) Anyway, is there a way to see that certificate again? – user1301428 Jan 14 '13 at 9:53
The only place I would know to look would be – Stephen Jennings Jan 14 '13 at 19:01
I know this is an old question, but the abbreviations in the server name are "Amsterdam Production" so that shows where you're connecting to – Matthew Steeples Jan 21 '15 at 21:02

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.