Symptoms
- Specific app can't connect to the internet or a network resource
- Error message mentioning a network or connection timeout
- Other apps and browsers work fine
- Problem started right after installing new security software
Likely causes
- CommonFirewall rule blocking the app by defaultSome apps need explicit permission through the firewall, especially ones that listen for incoming connections.
- CommonThird-party antivirus firewall interferingA separate antivirus firewall can block traffic independently of Windows Firewall.
- PossibleApp itself misconfigured or corruptedA damaged installation can sometimes look like a firewall problem.
What to do
- Open Windows Firewall settings and check 'Allow an app through firewall' for the program in question.
- Add the app manually if it isn't listed, allowing it on both private and public networks as appropriate.
- Check any third-party antivirus for a separate firewall setting that might also be blocking the app.
- Temporarily disable the firewall briefly as a test only, then re-enable it immediately after confirming the cause.
- Restart the app and the computer after making firewall changes.
- Reinstall the app if firewall changes don't resolve it, in case the installation itself is at fault.
- Check for a pending Windows or app update that might address a known connectivity bug.
When to call a pro
If firewall settings look correct but the app still can't connect, a technician can check for deeper network configuration issues.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.