Can't access steam page, access denied

Have you tried using a different browser? Deleting cookies/site data? Restarting?

I have this problem on rare occasions, and it's definitely on Steam's end. You can call it a hickup. Just try it in a couple of minutes, it should resolve itself shortly.

I had the same issue a couple days ago for about a hour and then it went back to normal. Haven't had trouble since.

If I remember right that just means that steam has blocked your ip for one hour. Try later or get a new ip.

Happens to me sometimes (and usually, at the same time, the steamcommunity domain does work). And when this occurs, I am able to access the store from other IPs. So my bet is I get IP-banned for a few minutes or hours, particularly since it generally occurs after I've been browsing the site intensively (typically, this occurs during Steam events where you need to browse your suggestions queue 3 times to unlock some sales cards).

Try this:
1: Open "Steam".
2: Go to "Settings"
3: Choose "Web Browser"
4: Delete "Browser Cache" and "Browser Cookies"

Then check to see if fixed.