Outlook 2010: The server you are connected to is using a security certificate that cannot be verified
|Email Client:||Microsoft Outlook 2010|
|Error Message:||The server you are connected to is using a security certificate that cannot be verified. The target principal name is incorrect.
|Solution:||This error is caused by a mismatch in enabling SSL and your port number in your account settings. Open Account Settings in Outlook and click on the advanced tab. If you need further assistance to open your account settings please see our Outlook 2010 Accessing Account Settings guide.
Verify that you are using the correct ports for the incoming and outgoing mail server. If you are going to use the SSL enabled settings you will need to use the correct servers. If you are on a shared hosting plan, you would use:
secure##.inmotionhosting.com (you will need to replace the ## with the server number in your Temp URL)
We recommend using the SSL enable options. If by chance you are in a school or somewhere that may have these ports blocked, you can use the non-ssl settings. The correct ports are below:
Important! To get your SSL settings please see our article on Getting Started Guide: Email.
Non-SSL incoming POP: 110
Non-SSL incoming IMAP: 143
Non-SSL outgoing SMTP: 587
SSL enabled incoming POP: 995
SSL enabled incoming IMAP: 993
SSL enabled outgoing SMTP: 465
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2014-05-01 7:45 am
The port details are correct, but still the same error is seen. "The server you are connected to is using a security certificate that cannot be verified. The target principal name is incorrect”.
Secondly when I clicked “view certificate”à it shows issued to gmail.com and the same settings are done in incoming and outgoing account settings. Also the certificate status says” The certificate is OK.”.
I tried all trouble shooting including system restore…but nogo. Your help in this regard is highly appreciated.
2014-05-01 7:58 am
If you're using a hostname which is not covered by the SSL certificate, this warning will appear. Could you clarify the hostname that you are using within your incoming/outgoing mail server settings?
2014-05-01 8:21 am
Good to see your quick response. Here are the details requested.
E-mail Client: MS outlook 2007
OS: Win XP SP3
Incoming mail server: imap.gmail.com
Port: 993, SSL type
Outgoing mail server:smtp.gmail.com
Port: 587, TLS type
Secondly when I try the test account settings button, it says its successful and I receive a test mail too.
2014-05-01 9:23 am
Unfortunately, I don't have exact details on why you may be getting this error in Gmail, but you may attempt to permanently save the exception. The Gmail forums may have more information for you as well.
2014-08-08 1:37 pm
From "Outgoing Server" Uncheck My outgoing Server(SMTP) Requires Authentication.
it worked for me :)
2014-09-10 6:21 am
I've been searching the web for an answer to this very problem, but with my local provider and using Outlook 2013 - POP/SMTP. The above replay gave me the hint:
There was nothing wrong with the names, but I found out that in the advanced settings of the account for " Use the following type of encrypted connection" I had set "Auto". When set to "none" the problem disappeared!
2014-12-24 12:21 am
Hi, I have same problem, but i am using yahoo mail.
wiewing same msg of error.
i tried all above options but this is all matching, ports are ok,
"The server you are connected to is using a security certificate that cannot be verified. The target principal name is incorrect”.
Secondly when I clicked “view certificate”à it shows issued to .imap.mail.yahoo.com
and the same settings are done in incoming and outgoing account settings. Also the certificate status says” The certificate is OK.”.
In advance settings incoming server SSL and port 993
Outgoing server ... SSL and port is 465.
I am able to send and receive emails also but only when i am starting outlood daily , only that time this error appears.
any advice plz??
2014-12-24 6:48 am
Thanks for the question. The article above is primarily intended for Outlook users, but in your case, this issue is happening when you are connecting with the Yahoo email client. The message occurs because the server name on the certificate does not match the name of the mail server in your settings. Click View Certificate again and either use the name they provided imap.mail.yahoo.com or look for Details in the certificate and find Subject Alternative Name. You should be able to find other mail server names you can use for the Yahoo setting in the "DNS Name=" line.
Also, when I researched this issue. I found another post that mentioned that Internet Search Providers (such as AT&T) have changed security. So their outgoing server settings for Yahoo may have changed. For example, with AT&T Yahoo service, the email server setting should be smtp.att.yahoo.com. This may differ depending on your ISP. If you're not sure, contact their technical support team for more information.
I hope this helps to explain and resolve the issue for you! Please let us know if you require any further assistance. If you require any further email assistance, make sure to check out our Everything Email section.
2014-12-28 12:26 am
I found that when I manually changed the account type to pop3 from imap this resolved the issue for me.