Fix it

Your firewall is blocking CaptionX

Run the command below in PowerShell as Administrator, then fully quit and reopen Premiere Pro.

The fix

Get-NetFirewallApplicationFilter | Where-Object { $_.Program -like "*Adobe Premiere Pro*\CEPHtmlEngine\CEPHtmlEngine.exe" } | ForEach-Object { Get-NetFirewallRule -AssociatedNetFirewallApplicationFilter $_ } | Where-Object { $_.Action -eq "Block" } | Remove-NetFirewallRule

Open the Windows Start menu and type PowerShell.
Right-click Windows PowerShell in the results and choose Run as Administrator.
Paste the command above and press Enter.
Fully quit Premiere Pro, reopen it, and sign in to CaptionX again.

Heads up: these firewall rules were added to your computer by something — antivirus, a script, your IT department, or you. We don't know what. Running this command removes them so CaptionX (and every other Premiere extension) can reach the internet again. You decide if that's the right call for your setup.

Didn't work?

If the command ran but sign-in still fails, the block is probably coming from a third-party antivirus (Bitdefender, ESET, Kaspersky, Norton, Avast, McAfee). Open its settings, find Application rules or Firewall exceptions, and remove or allow CEPHtmlEngine.exe. It lives in your Premiere install folder.

Using a cracked or non-official copy of Premiere? The firewall block is often part of how that copy was set up to run, and the command above can't undo it. The cleanest way to get CaptionX working is to use an official Premiere install — Adobe offers a 7-day free trial, and CaptionX works out of the box on a legitimate copy.

Still stuck? Email support@caption-x.com and we'll help you work out what's in the way.