We are working with a vendor to set up Enterprise Synthetic Monitoring agents on their machines. The vendor needs to know how the communication is encrypted before moving forward. From what I found in the technical notes is that communication for 12.3.6 is using TLS v1.0.
We are using ESM 12.3.6 but I do see that it is possible to use TLSv1.2 in the 12.4 release and I believe AES is the only option for that protocol. We do not plan on upgrading until 12.4.5.
I can open up a ticket if needed for security reasons.
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