Error Code 11402 to Call REST API from Azure Data Factory

Error Code 11402 may indicate network-related issue, please try to locate the cause below:

• DNS Resolution: Ensure that the Base URL is correctly resolved by the DNS server used by the ADF environment. You can try using an IP address instead of the URL to see if it resolves the issue.
• Network Configuration: Verify that the network configuration in ADF allows outbound connections to the Base URL. Check any firewalls, proxies, or network security groups that might be blocking the connection.
• Authentication: Ensure that the authentication details (username and password) are correctly configured in the REST linked service. Double-check that the credentials are valid and have the necessary permissions.
• Certificates: If the REST API requires SSL/TLS certificates, make sure that the certificates are correctly installed and trusted by the ADF environment. You might need to configure the enableServerCertificateValidation property in the REST linked service.
• Integration Runtime: Ensure that the Integration Runtime (IR) used by ADF has the necessary network access to reach the Base URL. Sometimes, the IR might be restricted by network policies.
• Postman vs. ADF: Since Postman works but ADF doesn't, it might be helpful to compare the network settings and configurations between the two environments. Look for any differences that might explain why ADF is unable to resolve the URL.