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Web proxy reporting false certificate issues

This started this morning (5/30).

Example site

https://www.dslreports.com/

 

I'm not sure what has expired as the cert is good through the end of June.  Both utm and client pc date is accurate.  Thoughts?

 

Edit:  Here's the lines from the proxy log.

 

2020:05:30-12:11:31 utm httpproxy[6727]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="CONNECT" srcip="10.10.5.100" dstip="64.91.255.98" user="" group="" ad_domain="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Web Filter Profile)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="3883" request="0xd32d5800" url="https://www.dslreports.com/" referer="" error="Failed to verify server certificate" authtime="0" dnstime="2" aptptime="66" cattime="71" avscantime="0" fullreqtime="242853" device="0" auth="0" ua="" exceptions="patience" category="165" reputation="neutral" categoryname="Technical/Business Forums" country="United States"
2020:05:30-12:11:32 utm httpproxy[6727]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="CONNECT" srcip="10.10.5.100" dstip="64.91.255.98" user="" group="" ad_domain="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Web Filter Profile)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="3883" request="0xd4979c00" url="https://www.dslreports.com/" referer="" error="Failed to verify server certificate" authtime="0" dnstime="3" aptptime="67" cattime="68" avscantime="0" fullreqtime="243232" device="0" auth="0" ua="" exceptions="patience" category="165" reputation="neutral" categoryname="Technical/Business Forums" country="United States"

 

 

Edit2:

https://support.sectigo.com/articles/Knowledge/Sectigo-AddTrust-External-CA-Root-Expiring-May-30-2020

Looks like this is not a utm issue but rather poorly implemented certs?

 

Edit3:  Maybe this is a utm issue as it's not following the cert chain properly?



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