The two sides in pro hockey's labor dispute did not meet face-to-face, but federal mediator Scot Beckenbaugh went back and forth between league headquarters and the hotel in which union officials were staying.
There was no indication as to when a joint meeting would take place.
A lockout by owners threatens to create a lost NHL season for the second time in eight years.
All games through Jan. 14 have been wiped out and NHL Commissioner Gary Bettman said a regular-season of at least 48 games would have to begin by Jan. 19.
The lockout began when the previous collective bargaining agreement expired Sept. 15.