SHA-1 Certificates will be rejected by the latest browsers.

Websites and systems protected using certificates using Sha-1 algorithms will no nonger be accepted by new browsers.  IE11 and Chrome for example wont allow a user to continue on to the site regardless.

Most public CA's have been issuing more scure certificates for some time now, however many internal CA's are still using Sha-1 to sign their certificates.

Its time to check and upgrade/reconfigure  if you want your systems to keep running smoothly.

Microsoft for example has several articles on how to deal with the situation in their support site.

I recently helped a customer running Windows Server 2008 Domain to upgrade their CA to issue the higher security certs.

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