How to denied or allowed any application permissions to access APIs websites using firewall?

If you mistakenly denied application permissions to access certain APIs or functionalities, you can usually grant those permissions again by following the steps based on your operating system:

For macOS:

1. Go to System Preferences.
2. Navigate to Security & Privacy.
3. Select the Privacy tab.
4. From the left pane, find the category for which you denied permission, e.g., Files and Folders or Full Disk Access.
5. Unlock the settings by clicking the lock icon at the bottom left corner and entering your password.
6. Check (or add and check) Postman in the list of applications that can access that category.

For Windows:

If the permission was for a system-level task, such as network access:

1. Go to the Control Panel.
2. Navigate to System and Security > Windows Firewall.
3. Click on Allow an app through Windows Firewall.
4. Find Postman in the list and ensure it has the necessary permissions.

If it was a browser-level permission (if you used Postman for the web):

1. Navigate to your browser’s settings.
2. Find the Privacy or Site Settings section.
3. Look for permissions or exceptions lists and modify the settings for Postman or the specific API endpoint.

For Linux:

The steps can vary depending on the distro and what kind of permission you denied. However, in general:

1. If it was a system-level permission, consider launching Postman with elevated privileges using sudo.
2. If it was a browser-level permission (for Postman for the web), modify the settings in your browser’s privacy or site settings similar to the steps outlined for Windows.

Rajesh Kumar

I’m Rajesh Kumar, a DevOps, SRE, DevSecOps, Cloud, and Platform Engineering expert passionate about sharing practical knowledge, real-world experiences, and industry best practices. I have worked at Cotocus and regularly write about technology, travel, investing, health, product reviews, and digital marketing through my various platforms.

I publish technical articles at DevOps School, travel stories at Holiday Landmark, stock market insights at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at TrueReviewNow, and SEO and digital marketing strategies at Wizbrand.