You are getting Status HTTP Response 500 – Connection Broken during RFC Connection.
On dev_icm logs, there is the following entries:
[Thr <thread_number>] Error Code: 13 (HTTP_1_1_REQUIRED)
[Thr <thread_number>] HTTP/1.0 500 Connection broken
SAP Netweaver all versions
HTTP 500 Connection Broken, HTTP_1_1_REQUIRED, Error Code 13, HTTP/2 , KBA , BC-CST-IC , Internet Communication Manager , Problem
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