Hello I use DST Root CA X3 for secure communication of my IOT device... which is valid untill 30.09.2021. Since lets encrypt is switching to new Root ISRG Root X1 which is valid untill 2035.. But i am unable to connect Using this new Root...My question is, is it because i still see DST root CA X3 as main root in my default certifcate chain... My cert chain is like this...DST root CA X3 ->ISRG root X1 ->R3 ->end cert(leaf)... my question is when will i be able to see default chain like this ISRG Root X1 -> R3 ->end cert (leaf) will this change after 30th of september next month??
Kind Answers will be highly appreciated