Beginning with version 2.0b3, "display/port" field from
previously-saved server configuration data is
interpreted in the connect dialogue strictly as a
display number. Server connections which were, using
previous versions of cotvnc, configured by specifying a
port number will have that port number silently
mis-interpreted as a display number, causing cotvnc to
attempt connection to port #(configured port + 5900).
Given that previous versions were able to determine
whether a display number or port number was specified,
this version should do the same and if it finds a port
number, explain the situation and offer to update user
configuration to be compatible with new behavior.
see also: ticket 1302701