A query because in my log server often appear strange reports like these? As if they were trying to report to my server?
017-03-14 03:27:37 DEBUG: [823CFD8E: 5082 < 206.221.188.26] HEX: 494e56495445207369703a313030403138312e34302e3130302e3434205349502f322e300d0a5669613a205349502f322e302$
2017-03-14 03:27:37 DEBUG: [0C6B1145: 5081 < 206.221.188.26] HEX: 494e56495445207369703a313030403138312e34302e3130302e3434205349502f322e300d0a5669613a205349502f322e302$
2017-03-14 03:27:37 DEBUG: [4BEB13B2: 5084 < 206.221.188.26] HEX: 494e56495445207369703a313030403138312e34302e3130302e3434205349502f322e300d0a5669613a205349502f322e302$
2017-03-14 03:27:37 DEBUG: [4BEB13B2: 5084 > 206.221.188.26] HEX: 5e39
2017-03-14 03:27:37 WARN: Unknown device - 1413816435 (206.221.188.26)
What's strange about it? Looks like some random network client is sending data to your server. That would always happen if you have a public server.
One recommendation would be to disable ports that you don't need in the config.
A query because in my log server often appear strange reports like these? As if they were trying to report to my server?