Whitelisting CheckView in Defender Pro

If CheckView detects that Defender Pro (by WPMU DEV) is blocking requests to your site, you will see an error message indicating that Defender Pro is preventing CheckView from connecting. This guide explains how to add CheckView’s IP addresses to Defender’s allowlist so tests can run without interference.

Why Defender Pro Blocks CheckView

Defender Pro includes an IP lockout firewall that monitors login attempts, 404 errors, and unusual request patterns. When CheckView runs tests on your site, the automated requests can trigger Defender’s lockout rules, causing CheckView’s IP addresses to be temporarily or permanently banned.

How to Whitelist CheckView in Defender Pro

Step 1: Open the IP Banning Settings

  1. In your WordPress admin, go to Defender → Firewall → IP Banning.
  2. You will see two tabs: Blocklist and Allowlist.

Step 2: Add CheckView’s IPs to the Allowlist

  1. Click the Allowlist tab.
  2. In the text area, enter CheckView’s public IP addresses, one IP address per line.
  3. Both IPv4 and IPv6 addresses are supported.
  4. You can find the current list of CheckView’s IP addresses on the Whitelisting CheckView’s Public IPs page.
  5. Click Save Changes to apply.

IP addresses on the Allowlist will never be locked out or banned by Defender, regardless of their activity on your site.

Optional: Sync Allowlist Across Sites via Hub

If you manage multiple sites with WPMU DEV’s Hub, you can create your IP allowlist once and sync it across all your sites automatically:

  1. In the IP Banning section, find the Central IP List toggle.
  2. Enable synchronization to sync your allowlist from the Hub to this site.
  3. Add CheckView’s IPs in the Hub once, and they will be applied to all connected sites.

Check for Existing Lockouts

If CheckView’s IPs were already locked out before you added them to the Allowlist:

  1. Go to Defender → Firewall → IP Banning → Blocklist.
  2. Check if any of CheckView’s IP addresses appear in the blocklist.
  3. Remove them from the blocklist if found.
  4. Then add them to the Allowlist as described above.

Verifying the Fix

After adding CheckView’s IPs to the Allowlist, return to your CheckView dashboard and retry connecting the website or re-run your test. If the error persists, verify that the IPs are not still present on the Blocklist and that no server-level firewall is also blocking requests.

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