Hi Guys, I have built a pbx for a customer running the latest version of Debian 3CX and when provisioning the handsets via the remote url the phones wont provision however if i disable the trusted cert part in security the phone will provision. we current have a single godaddy c2 cert and have tested on the web interface and its not reporting any errors with the certificate. The phones are running the latest firmware from the Yealink website. Yealink T26G - T46-18.104.22.168 Yealink T48G - T48-22.214.171.124 This document says that these firmware versions are supported and have the intermediate cert for go daddy installed. http://download.support.yealink.com... Certificates on Yealink IP Phones_V81_70.pdf I have tested the same firmware with the Lets Encrypt cert and its working flawlessly however i wish to use my own domain instead of the 3CX domain The phones return the following in the syslog <131>Mar 30 09:32:44 ATP : ATP <3+error > https to file failed, code = -23, msg = Unknown Error, retry = 1 <131>Mar 30 09:32:44 LIBD: DCMN<3+error > Certificate doesn't verify and error is 20, reason 134 Where am i going wrong?