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ERR_CERT_COMMON_NAME_INVALID in Chrome with DIR-615

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terryturbo:
I am helping a friend who has a DIR-615 and is having a strange issue where they cannot use Cisco Jabber. The Jabber client gives a certificate error when attempting to connect to loginp.webexconnect.com. So I tried to connect to that site via Chrome and I encountered a ERR_CERT_COMMON_NAME_INVALID error (an example is shown below). When they use their iPhone to tether for Internet access everything works fine.

I have tried various steps:

* Upgraded firmware from 8.02 to 8.05 B06
* Noticed the time and date weren't set so enabled NTP option
* Changed DNS to Cloudflare 1.1.1.1 & 1.0.0.1
* Tried disabling ALG for SIP under Firewall settings
* Tried disabling SPI under Firewall Settings
* Tried putting PC in DMZ
Any ideas on what else I can try? Recognize this is a legacy router so they should just go out and buy a new one but thought I would try and see if there were any ideas here. Just strange it only happens via the DIR-615. I didn't think it would interrupt SSL traffic.

Thanks!

FurryNutz:
What is the Mfr and model# of the Internet Service Providers modem/ONT the router is connected too?

terryturbo:
The cable modem is a Thomson THG571.

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