Website Blocked or Access Denied
A site you need for work is blocked, returns an error, or just won't load
⚠ Common symptoms
- "ERR_BLOCKED_BY_ADMINISTRATOR" or "Access Denied" in the browser
- Site loads fine on mobile data or at home, but not on work Wi-Fi
- A specific tool or platform loads its homepage but blocks login
- Your browser shows a certificate warning before the block page
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1
Identify who is blocking the site
The block message itself usually tells you: a browser-level block says "Your administrator has blocked this site." A network-level block (from a firewall or DNS filter) usually shows a branded block page from tools like Cisco Umbrella, Forcepoint, or Zscaler. Knowing the source determines who can un-block it.
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2
Check browser extensions and parental controls
Certain browser extensions (ad blockers, security tools, VPN extensions) block specific sites. Try opening the site in an Incognito or Private window, which disables most extensions by default. If it loads there, an extension is the blocker — disable them one at a time to find the culprit.
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3
Check your hosts file for manual blocks
Some software (and malware) adds entries to the system hosts file to block domains. Open Notepad as Administrator and open the file at:
C:\Windows\System32\drivers\etc\hostsLook for any lines pointing the blocked domain to 127.0.0.1. Delete those lines, save the file, and retest.
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4
Request an exception from your IT team
If the block comes from a corporate firewall or DNS filter, only your IT/network team can whitelist it. Contact your IT help desk with the exact URL, a brief business justification, and the error message you're seeing. Most corporate IT teams can process whitelisting requests within a business day.
Do not attempt to bypass corporate network blocks using a personal VPN on a company device. This violates most acceptable-use policies and could result in a security review of your device.