TLS connection error

hhopkins 1 Reputation point

I have a web app running on Azure "Cloud Service (Classic)" VMs on Windows Server 2012 R2. My TLS certificate is valid (I just double checked) but as of a few weeks ago (maybe longer) my HTTPS endpoint now returns an ERR_CONNECTION_RESET. The HTTP endpoint resolves fine. Other than updating my certificate a year ago, I have changed nothing of significance on my VM configuration (as far as I can tell). Can anyone suggest some steps to troubleshoot? I am at a loss how to figure this out since I changed very little in the past year. I thought maybe my site was still somehow using SSL and not TLS, but from what I've read, TLS is the default on 2012. Any advice would be appreciated.

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An Azure service that is used to provision Windows and Linux virtual machines.
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  1. Lex Li (Microsoft) 4,242 Reputation points Microsoft Employee

    It was recently that major browser vendors decided to only allow at most one year validity on HTTPS server certificates.

    Many CAs informed their customers in the past few months, so probably you can find such in your mailbox somewhere, like

    So you should get a new certificate as soon as possible.

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