Error: This port is already used! Do you want to restart?
The following error message occurs several times, when attempting to change the symbology for any data layer drawn in an ArcMap document:
"This port is already used! Do you want to restart?"
Interference is coming from the Brownie software utility. Brownie is a Brother utility installed with Brother printers, including the HL1470N.
A Web link is available in the Related Information section providing a description of the Brownie utility.
Solution or Workaround
Uninstall the Brownie utility. For instructions see Related Information section.