About version difference between UF and SH.

[oda]

I saw it.
https://docs.splunk.com/Documentation/Forwarder/7.2.4/Forwarder/Compatibilitybetweenforwardersandind...

I am using IDX of 6.4 and UF of 7.2.
However, I can not communicate from client hello to x.

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An S in a cell indicates that this version of forwarder can send data to this version of indexer after you change the Secure Sockets Layer (SSL)/Transport Layer Security (TLS) version and cipher suite on the forwarder. See Known Issues in the Splunk Enterprise Release Notes for instructions on changing the SSL/TLS version and cipher suite.

I do not understand what settings I should add to UF.
Please teach me

[markusspitzli]

With Version 6.6.0 they made fixes on the ssl handling. You have to tweak the settings on the UF so that it uses an "insecure" Version of SSL/TLS.
Another possibility is to upgrade the IDX to at least 6.6.