Unable to Access app.zentracloud.io

Why can’t I access app.zentracloud.io from my work computer, but it works on my phone or home network?

This typically indicates that your organization’s firewall or network security settings are blocking one or more required ZENTRA Cloud endpoints. Even if app.zentracloud.io itself is allowed, supporting domains may still be blocked. Phones and personal networks are usually not behind the same firewall, which is why access still works there.

What exactly needs to be whitelisted by our IT department?

Your IT team must allow:

Most access issues occur because api.zentracloud.io is allowed but iapi.zentracloud.io is blocked.

The app relies on iapi.zentracloud.io for all authenticated requests, so blocking it will cause the application to fail to load or function properly.

What symptoms indicate a firewall or security rule is blocking access?

Common signs include:

• The site does not load at all (blank page or timeout)
• The login screen appears but actions do nothing
• Spinning loaders that never complete
• “Unexpected error” or “Cannot reach server” messages
• Access works on mobile hotspots, home Wi-Fi, or personal devices

If this occurs only on the corporate network, it is almost always a security filtering issue.

What should IT check or adjust to resolve the issue?

Your IT team should verify:

Whitelisting

Ensure the following domains are whitelisted for HTTPS (port 443):

app.zentracloud.io 
          iapi.zentracloud.io
          api.zentracloud.io

DNS filtering

Confirm none of the above domains are being blocked or rewritten by:

• Web filters (e.g., Cisco Umbrella, ZScaler, Barracuda)
• SSL inspection policies
• Zero Trust or network segmentation rules

Firewall inspection

Some enterprise firewalls mistakenly categorize API endpoints as “Unknown,” “Dynamic DNS,” or “New Domains,” which can lead to auto-blocking.

Make sure rules allow traffic to our API endpoints.

Who should I contact if issues persist after whitelisting the domains?

If whitelisting the required domains does not resolve the problem, please reach out to Support with:

• Your organization name
• A brief description of the issue
• A screenshot of any error message
• (Optional) A HAR file from your browser’s developer tools

We’re happy to work directly with your IT team.