On os x Lion (10.7.1), DiskImageMounter is the program used to open dmg files so that the user can install new programs. When I try to open images on my system attached to my home network they do not open. When I connect to the tethered network from my cell phone I can open them using the mac utility. What is wrong with my router and/or modem? I have a netgear router and and arris modem.
As it turns out I had to power-cycle my cable modem which was delivering a few bad packets to my terminal over wi-fi.