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If you cannot open Parallels Desktop after changing the /etc/hostconfig file

APPLIES TO:
  • Parallels Desktop 5 for Mac Standard Edition
  • Parallels Desktop 4 for Mac Standard Edition

Symptoms

If you occasionally changed the /etc/hostconfig file by adding the PARALLELS=-NO- line, you may get the following error message when attempting to open Parallels Desktop:

"Unable to connect to Parallels Service. Make sure that prl_disp_service is running or check your firewall settings."

To be able to open Parallels Desktop, you need to edit the /etc/hostconfig file.

Resolution

To edit the /etc/hostconfig file:
1. Open Terminal and enter the following command:

$ sudo vi /etc/hostconfig
2. Enter your password when prompted.
3. Press the I key to be able to edit the file.
4. Change
PARALLELS=-NO-
to
PARALLELS=-YES-
Use the arrow keys to move between the lines and Backspace to delete unnecessary symbols.
5. Press Esc when finished.
6. To save your changes and close the file, type
:wq
and press Enter.
7. Restart your Mac for the changes to take effect.

Related Articles

Parallels Desktop failed to start due to "Unable to connect to Parallels Desktop" error

What processes should I allow in Mac's Firewall for Parallels Desktop?

Unable to connect to Parallels Service error when starting Parallels Desktop

Unable to connect to Parallels Service error at Parallels Desktop start




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