I cloud not import the root ca cert of let's encrypt (ISRG Root X1). In my case I had to covert the file to unix line endings, the downloaded one had windows. model: RB960PGS revision: r2 firmware-type: qca9550L factory-firmware: 6.44.6 current-firmware: 7.10.1 upgrade-firmware: 7.10.1 This can be d...