WS 2016 Essentials AD Domain controller errors

It seems like the changes made during the removal and reinstallation of the certification authority on your Windows Server 2016 Essentials might have led to issues impacting crucial services like Active Directory and Group Policy. Here are some steps to help troubleshoot and potentially resolve these issues: 1. Check Active Directory Configuration: - Validate the Active Directory setup and look for any misconfigurations or inconsistencies that might be causing the critical AD error (Event ID 4015) and connectivity issues. Ensure that the AD DS deployment is functioning correctly. 2. DNS Configuration Check: - Since DNS is crucial for the proper functioning of Active Directory, verify the DNS configuration to ensure that it aligns with your domain and the AD setup. Address any DNS issues detected, as they can lead to AD-related errors. 3. Group Policy Troubleshooting: - The error related to Group Policy (Event ID 1054) might indicate issues with network connectivity or domain controller discovery. Verify the network settings, domain controller availability, and any recent changes that might affect these services. 4. Certificate Authority Connectivity: - Address the connectivity issue to the Active Directory containing the certification authority (Event ID 44). Verify the trust relationship between the CA and Active Directory. Ensure that the CA can communicate with the DCs correctly. 5. Server Share Folder Access: - Restore access to shared folders by troubleshooting any permissions issues that might have arisen due to recent changes. Verify the shared folder configurations, check NTFS permissions, and confirm access rights. 6. Event Log Analysis: - Thoroughly investigate the Windows event logs to gather more detailed information about each error. Look for patterns or common factors that might point to a root cause shared by these different issues. 7. Seek Professional Assistance: - If the issues persist or if you are unsure about making further changes, consider reaching out to a professional IT consultant or Microsoft support for in-depth troubleshooting and assistance with restoring functionality. By following these steps and addressing the configuration and connectivity issues affecting your server, you should be able to resolve the errors and restore the proper functioning of Active Directory, Group Policy, and the Certification Authority.