While the 1.14d classic client can still connect to classic Battle.net, the population is significantly lower than in Resurrected.
With Diablo II: Resurrected receiving seasonal updates (Ladder 5, Mosaic Assassin, Sunder Charms), the official 1.14d Battle.net is a ghost town. Blizzard quietly disabled TCP/IP support in the Resurrected client to push players toward their modern servers. diablo 2 lod 1.14d