I had attempted all the fixes in that other article above "Sync 2.5 no peers" and they didn't work. Downgrading both peers to 2.4.5 instantly fixed the connection issue and syncing has returned. I'd recommend EVERYONE avoid 2.5.x until this issue is fixed or be prepared to downgrade to 2.4.5. I'm so pissed with support for taking 5 days on this and not realizing 1) this is a known 2.5 issue & 2) to not recommend downgrading to 2.4.5.