The security certificate is not from a trusted authority (2024)
If you are trying to configure Outlook to access Exchange Server and receive the following error when you enter your username and password, it means the security certificate used on the Exchange server is probably a certificate issued by the Exchange server organization instead of one purchased from a trusted certificated authority (such as Thwathe, Verisign, etc).
There is a problem with the server's security certificate. The security certificate is not from a trusted certifying authority. Outlook is unable to connect to the server www.domain.com. (Error Code 8).
Outlook will be unable to connect to the server until you trust the issuer by installing the certificate or the certificate is replaced with a certificate purchased from a trusted authority.
Trusting the issuer is as simple as adding the certificate to the Trusted Root Certification Authorities .
To trust the issuer, you need to be able to view the certificate and install it. If the dialog Outlook presents does not include a View Certificate or the certificate does not include an Install button, try logging into OWA from a web browser.
The easiest solution is to append TrustServerCertificate=True to the SQL Server connection string in your ASP.NET Core application's configuration. This will tell the connection to trust the certificate presented by SQL Server without further verification.
The most common cause of a "certificate not trusted" error is that the certificate installation was not properly completed on the server (or servers) hosting the site. Use our SSL Certificate tester to check for this issue. In the tester, an incomplete installation shows one certificate file and a broken red chain.
For an SSL certificate to be valid, domains need to obtain it from a certificate authority (CA). A CA is an outside organization, a trusted third party, that generates and gives out SSL certificates. The CA will also digitally sign the certificate with their own private key, allowing client devices to verify it.
Various types of SSL certificate errors are like Revoked, Self-Signed & Expired. Additionally, untrusted SSL certificates can be handled using ChromeOptions(), FirefoxOptions() & EdgeOptions() in Chrome, Firefox & Edge browsers respectively.
One of the most common reasons behind a TLS/SSL error is misconfiguration of your certificate during installation. If you have made any mistake during the certificate's installation, there is no way for the browser to verify your business identity properly.
Click Computer Configuration > Policies > Windows Settings > Security Settings > Public Key Policies > Trusted Root Certification Authorities. Select Trusted Root Certification Authorities, right click, and select Import to open the Certificate Import Wizard. Click Next on the Welcome screen.
Incorrect SSL/TLS configuration on the server is a common cause of SSL errors. This can include using outdated protocols or cipher suites that are no longer supported by modern browsers. Updating the server's SSL/TLS settings to use secure and up-to-date configurations can resolve these issues.
The curl command provides the -k or –insecure option to disable SSL certificate verification. This allows curl to perform “insecure” SSL connections and transfers without checking the authenticity of the SSL certificate presented by the server.
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