I am a (proud) owner of an BlackBerry Q10 (OS version 10.3.2) and get a certificate warning when visiting helloworld.letsencrypt.org.
After some research I found out that BlackBerry might be one of the last remaining OS/Tools which seem to not trust letsencrypt as a CA.
What can be done? Just wait until BlackBerry decides to import/trust the CA or is there something else which can be done (no, importing the chain is not an option )
I think the BlackBerry does not known about the ābridge trustā, the intermediate from lets encrypt is signed from a second root (forgot the signers name) to be trusted even when the letsencrypt root is not imported.
BlackBerry should really Patch their Browser soon.
Thatās correct - the root certificate currently used for cross-signing (as well as the ISRG root) is not included in the root certificate list BlackBerry ships with their devices. Someone mentioned asking BlackBerry about this a while ago, and they indicated that theyād look into adding the root certificate, but I havenāt seen anything more official or an ETA.
BlackBerry 10.3.3 will have Letās Encrypt trust built in, but if you are running 10.3 - 10.3.2 you can import all eight required certificates for full LE trust with just two clicks using my totally free BlackBerry 10 Native app multiCERT.