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Certificates confirm not only that the server is presenting the website you wanted to visit, but also that a certificate authority has confirmed that the company or organization behind the site is legitimate. If you encounter a problem verifying a certificate from a server, it's either a technical glitch or an attempt to scam you.

Date and Time

Just as your driver's license expires every few years, server certificates have expiration dates. If the server's operator hasn't renewed the certificate with the certificate authority which issued it by the expiration date, then your computer will not verify it as valid. However, your computer could reject a valid certificate if your date and time are not set correctly. If your computer thinks the current date is a time before the certification authority ever issued the certificate, then it will treat the certificate as invalid.

Certificate Usage

There is more than one type of server certificate. Some certificates authenticate a single domain, some authenticate multiple domains, while others certify multiple subdomains within one or more domains. If a website operator is trying to use a certificate for the wrong purpose, such as a single domain certificate when he needs a wildcard certificate for multiple subdomains, then your browser won't be able to verify the certificate.

Self-Signed Certificate

A server's certificate has to be signed by a certification authority for your browser to verify the certificate as valid. However, some servers, such as those operated by military or government organizations, sign their own certificates and act as their own certificate authorities. They have an internal method for authenticating the server certificate's signature, and don't rely on certificate authorities like everyone else does. A browser cannot independently verify self-signed certificates.

Fraud

There are a variety of technical issues that could produce browser error messages when you are visiting a perfectly legitimate site. However, the problem could also be that the server you are connected to is just pretending to be the site you wanted to visit. Aperio slide scanner. Your browser won't tell you specifically that a server is really an attempt to intercept your connection and steal your data. When you get a verification error, it is better to err on the side of caution than put your personal information at risk.

About the Author

Micah McDunnigan has been writing on politics and technology since 2007. He has written technology pieces and political op-eds for a variety of student organizations and blogs. McDunnigan earned a Bachelor of Arts in international relations from the University of California, Davis.

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Symptoms

After Lync users update to the latest Microsoft Lync Mobile 2013 client (5.4), they cannot sign in, and they receive the following error message:

Can't verify the certificate from the server. Please contact your support team.

Additionally, users may see the following entry or entries in the logs if the issue occurred on an iOS device:

Resolution

To resolve this issue, install your Enterprise Root CA Certificate on the iOS Device. You can do this manually or by using the Apple Configurator.

More Information

The cause of each message is slightly different, but both errors are caused by the inability to verify the authenticity of a certificate or certification authority.

For more information, go to the following Apple website:Digital certificates - iOS Deployment Reference

Or, contact Apple Enterprise Support for help with managing your iOS devices.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.