How to determine what version TLS is in use on Lync 2010

rdefino used Ask the Experts™
I need to determine what version TLS our Lync environment is using. Especially the edge servers themselves.

How can I do that?
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systechSenior Technical Lead


The Lync client can only use TLS connections, this behavior is not configurable (greyed out bydefault). Open Lync client>>Tools>>Options>>Personal>>Advanced>>Bydefault it uses the automatic configuration which is TLS (under connect using "TLS").

Hope this helps :)
Lead Infrastructure Architect
comment above it correct it will only work on TLS but...

to see what TLS protocols are server is responding on you can use something like SSLSCAN

this shows support matrix

to restrict the TLS versions
btanExec Consultant
Distinguished Expert 2018
the iiscrypto tool is handy to surface the overall crypto used as it grab directly from the machine registry SChannel setting (which Windows depends on)
- you can even use it to disable and enable as required and desired for lockdown. in fact, the Lync client (at least on 2010)  can only use TLS connections, this behavior is not configurable.

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