I've just exchanged text with another using messenger.  
When they requested remote assistance the message
Remote assistance connection could not be established
because hostname could not be resolved.  I am coming
through a firewall on my end and the assistance requestor
has a Verizon DSL connection.  What are the obstacles and
how can I address them?  Advice sought.

P.S.  If I am connected to the correspondent at work may
I leave for home and pick up the connection there?