TLS remediation caused clients to lose connection to URL

I do not need a solution (just sharing information)

We have Symantec Endpoint Protection ver14.2.758.0000 and Endpoint Encryption Suite 11.1.2 on a Windows 2012r2 server.  We recently perfomed a security scan and detected TLS version 1.0 was enabled.  Our solution was to deprecate TLSv1.0, deprecate TLSv1.1 and enable TLSv1.2.  Within a few days, clients who have accessed a specific URL routinely lost their connection.  We reversed the TLS remediation and restored the client’s access to their URL.

Question:  Why did this happen?  How should we have performed the remediation of TLS.  In doing an Internet Search I found indications that Symantec EndPoint might have been the source of the problem.  Is that correct?

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