PKIX Path building failed - started over the weekend

Good Morning,

over the weekend, I’m getting this error message (Java 12) when trying to connect to a domain using a let’s encrypt certificate:

PKIX path building failed: unable to find valid certification path to requested target

Typically, this error message appears, when a self-signed certificate is being used - which is not the fact. I am quite certain, this started to be an issue over the last couple of days. Looking at the certificate, however I do not see a problem. It’s

Does anybody have an idea what the problem could be?


Hi @newcron

there is a check of your domain, ~45 minutes old -


Domainname Http-Status redirect Sec. G 200 0.057 H 200 0.196 B

looks good, the certificate
expires in 80 days	*, *, - 3 entries

is new (but not created in the last days). But:

Chain - incomplete	

Your server doesn't send the intermediate certificate. That may be the problem.

Should look like

Chain (complete)	
	1	CN=*
	2	CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US

Hi Jürgen,

thanks for the input! Indeed that solved the problem! :slight_smile:


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