.CRL File Recovery

Have files been deleted due to a user’s error or software error? Have you formatted a disk by accident and need to know how to recover the files? Read our .CRL file recovery guide for Windows, MacOS, Android and IOS in 2024.

CRL File Recovery

What is a .CRL file?

Data file typically used by Web servers and encryption software; contains a blacklist of revoked digital certificates; stores information about the certificates, such as the issuer and the revocation date; enables security administrators to block untrusted entities.

What Are Common Causes of ".CRL" Files Lost or Failure?

There are several common causes for ".CRL" (Certificate Revocation List) files to be lost or fail:

  1. Network connectivity issues: If there are network connectivity problems between the client and the server hosting the ".CRL" file, the client may fail to retrieve the file, leading to its loss or failure.
  2. Server misconfiguration: Improper configuration of the server hosting the ".CRL" file can result in the file being inaccessible or not being served correctly to the clients.
  3. Certificate authority (CA) issues: If the CA responsible for issuing the certificates and maintaining the ".CRL" file experiences problems or goes offline, the ".CRL" file may not be updated or available, causing failure or loss.
  4. Expired or revoked certificates: If a certificate listed in the ".CRL" file expires or is revoked, the corresponding entry in the ".CRL" file becomes invalid. This can lead to failure or loss of the ".CRL" file.
  5. File corruption: In some cases, the ".CRL" file itself may become corrupted due to various reasons such as disk errors, file system issues, or improper handling. This can result in the file being lost or failing to function correctly.
  6. User error: Human error, such as accidental deletion or moving of the ".CRL" file, can also cause its loss or failure.
  7. Software or system issues: Problems with the software or system responsible for managing the ".CRL" files can lead to their loss or failure. This can include issues with the certificate management software or problems with the underlying operating system.

It is important to regularly monitor and maintain ".CRL" files to prevent loss or failure, as they play a crucial role in ensuring the security and validity of certificates in a public key infrastructure (PKI) system.

How to recover lost ".CRL" files?

Sometimes while working with a computer, laptop or other stationary or mobile devices, you may encounter various bugs, freezes, hardware or software failures, even in spite of regular updates and junk cleaning. As a result, an important ".CRL" file may be deleted.

Go to view
🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

🧺 How to Recover Files and Folders After Sending Them to the Recycle Bin and Deleting? (Windows 11)

By no means should you think that the only way to recover a ".CRL" file is always to create it once more.

Use programs for recovering ".CRL" files if a file was lost after accidental or deliberate deleting, formatting the memory card or the internal storage, cleaning the storage device, after a virus attack or a system failure.

Programs to recover ".CRL" files

Looking for a way to get files back? In cases when files were deleted and they cannot be restored by using standard operating system tools, use Hetman Partition Recovery.

The tool recovers data from any devices, regardless of the cause of data loss.

Follow the directions below:

  1. Download Hetman Partition Recovery, install and start the program.

  2. The program will automatically scan the computer and display all hard disks and removable drives connected to it, as well as physical and local disks.

    File Recovery Software
  3. Double-click on the disk from which you need to recover ".CRL" files, and select analysis type.

    Hetman Partition Recovery - Analysis Type
  4. When the scanning is over, you will be shown the files for recovery.

    Hetman Partition Recovery - Files that Can be Restored
  5. To find a file you need, use the program’s interface to open the folder it was deleted from, or go to the folder "Content-Aware Analysis" and select the required file type.

    Hetman Partition Recovery - Deep Scan
  6. Select the files you have been looking for and click "Recovery".

    File Recovery Software - Files List for Recovery
  7. Choose one of the methods for saving the files and recover them.

    Saving recovered files in Hetman Partition Recovery

How to open file with ".CRL" extension?

Looking for how to open a stereo certificate Revocation List File image file file?

Programs that open ".CRL" files

Microsoft IIS Microsoft IIS
Citrix NetScaler Citrix NetScaler
Globus Toolkit Globus Toolkit
Citrix NetScaler Citrix NetScaler
Globus Toolkit Globus Toolkit

Additional Information

  • File type: Certificate Revocation List File

  • File extension: .CRL

  • Developer: N/A

  • Category: Web Files

  • Format: N/A


We will be happy to answer your questions!

Comments (1)

  • Hetman Software: Data Recovery
    Hetman Software: Data Recovery 18.12.2019 14:15 #
    Leave a comment if you have any questions about Recovering lost .CRL files after deleting, cleaning or formatting!
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Vladimir Artiukh

Author: Vladimir Artiukh, Technical Writer

Vladimir Artiukh is a technical writer for Hetman Software, as well as the voice and face of their English-speaking YouTube channel, Hetman Software: Data Recovery for Windows. He handles tutorials, how-tos, and detailed reviews on how the company’s tools work with all kinds of data storage devices.

Oleg Afonin

Editor: Oleg Afonin, Technical Writer

Oleg Afonin is an expert in mobile forensics, data recovery and computer systems. He often attends large data security conferences, and writes several blogs for such resources as xaker.ru, Elcomsoft and Habr. In addition to his online activities, Oleg’s articles are also published in professional magazines. Also, Oleg Afonin is the co-author of a well-known book, Mobile Forensics - Advanced Investigative Strategies.


Questions and answers

  • What is a ".CRL backup" and why is it important in the context of computer security?

    A ".CRL backup" refers to a Certificate Revocation List backup. In computer security, a Certificate Revocation List (CRL) is a list of digital certificates that have been revoked or invalidated before their expiration date. It is maintained by a Certification Authority (CA) and used to verify the validity of certificates.

    A CRL backup is an important component of computer security because it serves as a safeguard in case the primary CRL becomes unavailable or corrupted. The backup ensures that the revocation status of certificates can still be checked even if the primary CRL is inaccessible.

    There are several reasons why a CRL backup is important:

    1. High availability: It ensures the availability of revocation information even if the primary CRL server goes down or experiences technical issues. This prevents situations where revoked certificates are mistakenly accepted as valid.
    2. Disaster recovery: In the event of a system failure, data loss, or natural disaster, having a CRL backup allows for quick recovery and restoration of revocation information. This helps maintain the security and integrity of the certificate infrastructure.
    3. Redundancy: It provides redundancy and fault tolerance by having multiple copies of the CRL. If one backup becomes unavailable, another can be used to validate certificates, ensuring continuous security operations.
    4. Compliance requirements: Many security standards and regulations, such as the Payment Card Industry Data Security Standard (PCI DSS) or government regulations, mandate the need for CRL backups. Compliance with these requirements is crucial for organizations handling sensitive data.

    Overall, a CRL backup is important in computer security to ensure the availability, integrity, and reliability of revocation information, which plays a vital role in maintaining the trust and security of digital certificates.

  • How can one create a ".CRL backup" and what are the best practices for storing and managing these backups?

    To create a ".CRL backup" (Certificate Revocation List backup), you can follow these steps:

    1. Identify the Certificate Authority (CA) responsible for issuing and managing the certificates.
    2. Access the CA server or the system where the CA software is installed.
    3. Locate the directory or storage location where the CRL files are stored. Typically, these files have a ".crl" extension.
    4. Create a copy of the CRL file(s) you wish to back up. This can be done by either copying the file(s) to a different location or by creating an archive (e.g., ZIP file) containing the CRL file(s).

    Now, let's discuss best practices for storing and managing these backups:

    1. Regular Backup Schedule: Implement a regular backup schedule to ensure that the CRL backups are up to date. This can be done daily, weekly, or according to your organization's requirements.
    2. Secure Storage: Store the CRL backups in a secure location to prevent unauthorized access. Consider using encrypted storage or access controls to protect the backups from being compromised.
    3. Off-Site Storage: Maintain a copy of the CRL backups in an off-site location. This provides an additional layer of protection in case of a disaster or physical damage to the primary storage location.
    4. Versioning and Retention: Maintain multiple versions of CRL backups to enable rollbacks if necessary. Establish a retention policy to determine how long to keep the backups based on compliance requirements or operational needs.
    5. Documentation: Maintain proper documentation regarding the backup process, including the location, schedule, and any relevant details. This documentation will be helpful for future reference or when transferring responsibilities.
    6. Testing and Restoration: Regularly test the restoration process to ensure the backups are valid and can be restored successfully. This helps identify any issues or errors in the backup process before they become critical.
    7. Monitoring and Auditing: Implement monitoring and auditing mechanisms to ensure that the backup process is executed as planned. Regularly review logs and reports to identify any anomalies or failures.
    8. Disaster Recovery Plan: Incorporate the CRL backup process into your organization's overall disaster recovery plan. This ensures that the backups are considered in the broader context of recovery strategies and procedures.

    By following these best practices, you can ensure the availability and integrity of your CRL backups, which are crucial for maintaining the security of your certificate infrastructure.

  • In the event of a system failure or data loss, how can a ".CRL backup" be restored to ensure the continuity of certificate revocation checks and maintain the security of digital certificates?

    In the event of a system failure or data loss, restoring a ".CRL backup" is crucial to ensure the continuity of certificate revocation checks and maintain the security of digital certificates. Here is a step-by-step guide to restoring the backup:

    1. Identify the backup location: Determine where the ".CRL backup" is stored. It could be on a separate server, a backup storage device, or a cloud-based backup service.
    2. Verify the integrity of the backup: Before restoring, it's essential to verify the integrity of the backup file. Check if the backup is complete and hasn't been corrupted or tampered with.
    3. Prepare the system: Ensure that the system where the backup will be restored meets the necessary requirements. This includes having the appropriate software, certificates, and configurations in place.
    4. Stop the services: Before restoring the backup, stop any services or processes that are responsible for handling certificate revocation checks. This ensures that no conflicts or inconsistencies occur during the restoration process.
    5. Restore the backup: Copy the ".CRL backup" file to the appropriate location in the system. This could involve replacing the existing ".CRL" file or merging the backup with the current data, depending on the backup strategy and system configuration.
    6. Verify the restoration: Once the backup is restored, verify its integrity and completeness. Ensure that all necessary data and configurations are present and that the system recognizes the restored ".CRL" file.
    7. Restart the services: After confirming the successful restoration, restart the services or processes that handle certificate revocation checks. This allows the system to resume its normal operations while utilizing the restored backup.
    8. Test certificate revocation checks: Perform thorough testing to ensure that the certificate revocation checks are functioning correctly. Verify that the system can properly identify revoked certificates and deny access when necessary.
    9. Update the backup strategy: After completing the restoration process, review and update the backup strategy if necessary. Consider implementing regular backups, off-site storage, and automated backup processes to minimize the impact of future system failures or data loss.

    By following these steps, organizations can restore a ".CRL backup" effectively, ensuring the continuity of certificate revocation checks and maintaining the security of digital certificates.

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