Common Causes of 403 Errors:
- Insufficient permissions: The user lacks the necessary permissions to access the requested resource.
- Authentication required: The server requires authentication to access certain resources, and the client has not provided valid credentials or authentication has failed.
- IP restrictions: The server restricts access to specific IP addresses or IP ranges, and the client’s IP address is not included in the permitted list.
- Server configuration: The server’s configuration prohibits access to certain files, directories, or areas of the website.
- Blocked by firewall or security software: A firewall or security software blocks access to the resource due to security policies, malware detection, or other security measures.
When I try to access postimages.org, the first thing I get is a warning that the site in unsafe. Happens with both Firefox and Brave. Warning appears to be from Cloudflare.
View attachment 2728941
Brave and Firefox both give me the option to ignore the warning. Your browser's security settings may not allow that. I would look at your browser's security settings. (Issue 5 in the list of possible issues.)