Werk #13086: Log error messages from the ICMP sender again.

Component The Checkmk Micro Core
Title Log error messages from the ICMP sender again.
Date Jul 19, 2021
Checkmk Editon Checkmk Enterprise (CEE)
Checkmk Version 2.1.0i1 2.0.0p8
Level Prominent Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The CMC didn't pick up any error messages from the ICMP sender, which could in turn result in blocking the sender. This was a regression from 1.6.0.

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