Install latest/stable of conn-check
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
conn-check allows for checking connectivity with external services. You can write a config file that defines services that you need to have access to, and conn-check will check connectivity with each. It supports various types of services, all of which allow for basic network checks, but some allow for confirming credentials work also.
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.