Remote Desktop Certificate Warning Show Up Again

This difficult to understand error means the security certificate your email server is using has expired or is invalid for other reasons.

I'g getting a security alarm when I open Outlook. It says: 'The server yous continued to is using a security certificate that cannot be verified. A required certificate is not within its validity menstruation when verifying against the electric current organization clock or the timestamp in the file'

That message is saying that the certificate the mail server uses has likely expired.

If you are the administrator, you need to install an updated certificate; if yous are an end-user, you need to speak to your admin. You can't hibernate the warning or turn it off, merely in all likelihood, it'due south safe to OK information technology and connect to your mail server.

The message fabricated perfect sense to me but not to the people who asked about it, and so I asked a couple of family members who aren't into technology what they thought the message was trying to tell them and what they would do if information technology came up while they were on the figurer. Their answer: it "hurt" to read information technology and they'd enquire me to look at information technology. I approximate that proves it's a poorly written, overly technical error message.

Target Principle name is wrong

I take a SSL IMAP email account that I just setup in Outlook. Every fourth dimension I run the program I get a popup: "Internet Security Warning" The server you are connected to is using a security certificate that cannot be verified. The target principle name is incorrect. View Certificate. The document is self signed and then I always merely click Aye to continue using the server/email account, just how do I get Outlook to retrieve?

This warning indicates the server name does not friction match the proper noun in your business relationship settings, or in the case of Commutation server, that the address in the autodiscover file does not match the address the server is using. This is a common problem when the administrator uses self-published certificates.

The easiest gear up is to change the server name, if your mail provider supports other server names.

For instance, in the dialog in this screenshot, the server certificate was issued to popular.secureserver.internet but I'm using mail.mydomain.com as the server proper noun in my business relationship settings. Since GoDaddy lets you employ either server name, you tin eliminate the error message if you use the secureserver.net server names.


To go your mail server's IP accost:

1. Type cmd on the Start menu to open a Command Prompt.
2. Blazon ping mail service.yourservername.com to find your IP accost and the hosts server name.
   
3. If the server name in the ping results matches the proper name on the certificate, use it as the postal service server name in Outlook.
4. If the name is different, ping the server name used in the certificate. If the IP accost matches your mail service server's IP address apply it every bit the post server name in Outlook.

If your host does non have a server name y'all tin can use to eliminate the error, John Roper-Lindsay uses these steps:
You can go effectually the "Target Principal Name is incorrect" by post-obit the steps below:

1. If you didn't ping your server for the IP address (or didn't make note of it), open up a cmd prompt and ping your incoming mail server - e.g. ping mail.fred.com returns IP accost like 111.222.111.222.
2. View the certificate every bit above and notation the server proper noun under Issued To.
   e.thou. elephant.giraffe.co.nz or *.giraffe.co.nz
3. Edit the hosts file and add a new line for IP address 111.222.111.222. The hosts file is in %windir%\system32\drivers\etc.
4. To open the hosts file, search for Notepad on the Showtime carte, correct click on information technology and choose Run every bit Ambassador. Paste the path to the hosts file in File, Open dialog. Select All Files as the file types on the correct.
5. The entry you create in the hosts file should look something like this.
   111.222.111.222 elephant.giraffe.co.nz
6. Edit Outlook account settings and change the incoming and outgoing mail service server to elephant.giraffe.co.nz

What does this do? Basically your mail server name needs to match the proper name on the certificate or Outlook volition complain. The above process changes the mail server name to the proper name on the certificate and the hosts file will ensure that post traffic to this server proper name will be correctly directed to your postal service server.

Note:- If the certificate name is wildcarded, i.e. *.giraffe.co.nz, you could create a hosts file entry of anything.giraffe.co.nz, as the wildcard will cover anything.
NOTE:- you won't demand to trust the certificate anywhere, as long as your mail provider is using a valid Certificate Authority to upshot the certificate, which they certainly should be.

Notation: This assumes the incoming and outgoing mail servers are the same. If they're not y'all may accept to fiddle effectually with 2 server names.

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Source: https://www.slipstick.com/outlook/security-warnings-in-outlook/

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