Since today I started to receive warnings from eset nod32 that x2.c.lencr.org is blocked. See image below.
I'll report the same findings to ESET as well, but just to double check here that you are or are not indeed compromised.
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Welcome to the Let's Encrypt Community, @daantimmer! 
I have notified the staff of this issue. Please be patient and give them a chance to respond.
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We occasionally get antivirus systems classifiying our URLs as malicious because they saw malware connecting to them, but that is a false alarm. I will submit a complaint to ESET.
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Also reported this to ESET
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