By default, if Mac is not connected to Proxy, Proxy Locator will try to establish contact with Proxy on hourly basis. If it's not successful for a period of one week - upon connection domain/credentials will have to be entered manually in a pop up window.
To change the 1 week timeout, execute the following command in terminal on Mac:
sudo launchctl setenv PMM_PROXY_LOCATION_TIMEOUT <seconds>
You will need to calculate the required amount of time in seconds. For example, 1 week will be 604800 seconds (there's a google calculator for that, to make your life easier).
If pma_agent (daemon) process is running it must be restarted to apply changes. It can be done with below commands:
sudo launchctl unload -w /Library/LaunchDaemons/com.parallels.pma.agent.launchdaemon.plist sudo launchctl load -w /Library/LaunchDaemons/com.parallels.pma.agent.launchdaemon.plist