Formerly as I remember I saw somewhere *dhvor- (door, gate, yard, court) connected with the root *vert- (turn) in PIE. This is quite realistic and can be supported with similar Russian words створка (stvorka) meaning leaf of a door or a gate or a small door, and затвор (zatvor) (gate, lock), both originating from PIE *vert-.
But Starostin links *dhvor- to Eurasiatic *durV (Kartvelian: *dur-, Dravidian: *tūr-) meaning "hole". This is quite strange given the difference in meaning and also that *durV strikingly resembles Russian дыра (dyra) also meaning "hole". Vasmer links Russian дыра with Lithuanian duríù, dùriau, dùrti (stab, make hole) but further etymology is uncertain. It is quite natural to suggest that this word is connected to Eurasiatic *durV instead of idea that *durV is connected to *dhvor-.