After adding a compatible device, the Garmin Express™ software program provides a button labeled "Garmin Connect" on the device dashboard. When selected, Garmin Express launches the computer’s default web browser to access your Garmin Connect™ account. This function may fail and show a "500 Server Error" message for one or both of these scenarios:
The computer has lost the association to a default web browser.
Malware, adware, or third-party software installers can change or break the computer's default web browser designation.
You can resolve this by manually setting the default web browser on your computer. You can find the steps below by selecting your operating system below:
Press the Windows key + R.
Type Control Panel.
Select OK.
Select Programs.
Select Default Programs.
Select Set your default programs.
Select your web browser's launch icon.
Select Set this program as default.
Select OK.
If the steps above do not work for your Windows version, refer to Microsoft Support - Change your default browser in Windows.
The default web browser setting can be changed by following the steps at this link: Apple Support - Change the default web browser or email app on Mac