Unfortunately with such a broad description of the problem, there's not much we can do unless we have some more info. Hopefully you can give us more of what the issue is and maybe we can help
First, are you sure you have good internet connectivity? Does the problem happen on both mobile data and WiFi or just on a specific connection? If only on WiFi, does it happen on any network (if not, the sites you're trying to access might be restricted by your network)?
Are the links only available at work? Have you tried opening the links on a different device in the same network or mobile data? Do you get any errors while trying to open the links/sites? Do you have any other issues with different sites/links? Have you tried a different browser? Are you using any VPN apps or ad blockers?