SymptomsParallels Desktop failed to start due to Parallels Dispatcher crash and "Unable to connect to Parallels Desktop" or "Unable to connect to Parallels Service" error is displayed:
Problem appears due to incorrect handling of inconsistent Mac OS X networking configuration.
ResolutionIf you are using Firewall or some network filtering software like "Little Snitch" application, please, make sure, that Parallels Desktop is in the list of approved applications.
1) Please start terminal (Application -> Utilities -> Terminal) and type the following commands (hit Return after each of them)
sudo cp /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist /Library/Preferences/SystemConfiguration/NetworkInterfacesBackup.plist
sudo rm /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
NOTE: all Mac networking settings will be rolled back to default and you will have to restore the VPN connections configuration manually in case you use them.
sudo cp /Library/Preferences/SystemConfiguration/preferences.plist /Library/Preferences/SystemConfiguration/preferencesBackup.plist
sudo rm /Library/Preferences/SystemConfiguration/preferences.plist
sudo cp /Library/Preferences/SystemConfiguration/preferencesBackup.plist /Library/Preferences/SystemConfiguration/preferences.plist
If you are using Parallels Desktop 4.0 for Mac, please revise the solution from Knowledgebase article 5772
If the solution did not help and you still receive 'Unable to connect to Parallels Service' error, please check another Knowledgebase article 6694 (suitable for Parallels Desktop 4.0 for Mac only):