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IP or Region Restrictions:
Verify if specific IP addresses, IP ranges, or geographical regions have been intentionally blocked.
If there is a restriction in place and it is unintentional, add the necessary IPs or regions to the whitelist.
Web Application Firewall (WAF):
Check the WAF settings used for website protection, as they might be causing such access issues.
Identify and address false positives and adjust the rules accordingly.
Server Configurations (Varnish Cache):
The "Varnish cache server" message in the errors suggests a potential issue with caching or proxy layers.
Examine and fix any misconfigurations in the Varnish setup.
Browser or User-Agent Restrictions:
Ensure that certain browsers or user-agents are not being unnecessarily blocked by server rules.
DNS or Routing Issues:
Confirm that the DNS settings and routing configurations are correctly set up.
If there are issues specific to regions, investigate potential DNS resolver problems.
Security Policies for HTTP Requests:
Review strict security controls on incoming HTTP requests that might result in blocking legitimate users.
Server Logs:
Analyze server logs to uncover detailed information about the error codes and affected user IPs.
Suggested Solutions:
Review Blocked Regions or IPs:
If unintended restrictions exist, whitelist the required IPs or regions to allow access.
Fix Varnish Configurations:
Revisit and amend any incorrect rules or configurations in the Varnish server setup.
Analyze Server Logs:
Examine the logs for more details about the cause of the issue, including error codes and specific IPs.
Access Tests:
Conduct access tests from different regions to ensure the issue is resolved.
If the website owner completes these checks and the problem persists, seeking further technical assistance might be necessary.
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