Hello All,
I had issues while upgrading from Katello 3.4 to 3.5, the issue because of candlepin version 2.1.14.-1. The cpdb did not accept the password even tried manually with the password there in /etc/candlepin/candlepin/conf.
So I had to downgrade the candlepin rpm with 2.0.40-1(candlepin-2.0.40-1 and candlepin-selinux-2.0.40-1) then the upgrade works fine and all looks good.
I don’t know who else had tried to upgrade or installed 3.5 wtih candlepin 2.1.14-1 version but this should be a bug in the upgrade.