You say that you’ve tried at one of the computers at work, do any of the others work? If not, it’s likely your employer has chosen to restrict network access for some reason to the community. If the others do work, try it in incognito mode, and if it still doesn’t work, restart both the computer and the browser. It would also help if you could describe any errors on the Dev tools console, and error codes from pages not loading. An interesting way to check if it is the browser or otherwise would be to use a command line tool like curl and see if it can access the forums.
If you are still having trouble with it, there’s a Discourse app that you can probably use while at work.