Event ID - 25

Event Id25
SourceMicrosoft-Windows-OnlineResponder
DescriptionOnline Responder Services: For revocation configuration %1, the signing certificate is going to expire soon.
Event InformationAccording to Microsoft :
Cause :
This event is logged when the signing certificate is going to expire soon.
Resolution :
Renew the signing certificate for the Online Responder
In order to function, an Online Responder needs to have a valid OCSP Response Signing certificate. Therefore, you need to renew the signing certificate.
For revocation configurations using manual enrollment for signing certificates, complete the following procedures:
  • Manually renew the OCSP Response Signing certificate.
  • Assign the OCSP Response Signing certificate to a revocation configuration.
  • Refresh revocation data.
For revocation configurations using automatic enrollment for signing certificates, renewal should take place without user intervention. Therefore, if renewal does not take place, it is probably blocked for some reason. Check the event log for additional errors or warnings that may be related to this error. If no other information is available, complete the following procedures:
  • Confirm that a certification authority (CA) is accessible.
  • Confirm that the OCSP Response Signing certificate template is properly configured.
  • Confirm that the OCSP Response Signing certificate template is available on the CA.
If renewal is still not possible, or if the OCSP Response Signing certificate cannot be used, complete the following procedures:
  • Confirm access to the OCSP Response Signing certificate by NETWORK SERVICE.
  • Modify the certificate renewal reminder period.
Manually renew an OCSP Response Signing certificate
To manually renew an OCSP Response Signing certificate:
  1. Click Start, type mmc, and then press ENTER.
  2. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  3. On the File menu, click Add/Remove Snap-in, click Certificates, and then click Add.
  4. Click Computer account, and click Next.
  5. Select the computer hosting the Online Responder, click Finish, and then click OK.
  6. Double-click Personal, and then double-click Certificates.
  7. Look for any certificates with the OCSP Signing enhanced key usage (EKU) extension.
  8. Right-click the certificate, point to All Tasks, and then click Renew Certificate with New Key or Renew Certificate with Existing Key to start the Certificate Renewal Wizard.
  9. Use the wizard to complete the renewal process.
  10. After the certificate has been issued, assign it to the revocation configuration by using the following procedure.
Assign an OCSP Response Signing certificate to a revocation configuration
To assign an OCSP Response Signing certificate to a revocation configuration:
  1. Click Start, point to Administrative Tools, and click Online Responder.
  2. In the console tree, expand Array Configuration, and click the node for the computer on which the error was logged.
  3. Right-click the revocation configuration identified in the event log, and click Assign Signing Certificate.
  4. Select the certificate, and click OK.
  5. Click Revocation Configuration, and then right-click the revocation configuration.
  6. Click Edit properties, and click the Signing tab. Select the Automatically use renewed signing certificates check box if you do not want to reassign the signing certificate to the revocation configuration manually each time the signing certificate is renewed. If you do not want this assignment to be made automatically, do not select this check box.
  7. When you are finished, use the following procedure to ensure the error does not recur.
Refresh revocation data
To refresh revocation data for an Online Responder by using the Online Responder snap-in:
  1. Click Start, point to Administrative Tools, and then click Online Responder.
  2. Right-click Array Configuration, and click Refresh Revocation Data.
  3. Confirm that no additional errors are reported.
  4. Click the Online Responder node, and confirm that the revocation configuration is listed as Working.
  5. Under Array Configuration, select the Online Responder computer that logged the error, and then click the revocation configuration named in the error.
  6. Under the details pane, view the Revocation Configuration Status pane for the status of the signing certificate and the revocation provider.
  7. Confirm that no additional errors are reported.
Revocation configurations configured for automatic enrollment of signing certificates
The previous procedure assumes that the OCSP Response Signing certificate was configured for manual enrollment and renewal. If the OCSP Response Signing certificate template was configured for autoenrollment, you need to confirm that no other issues are blocking the renewal process.
To perform these procedures, you must have membership in local Administrators, or you must have been delegated the appropriate authority.
Confirm that a CA is accessible
To confirm that a CA is accessible by a client:
  1. Open a command prompt window.
  2. Type certutil -ping -config%ltcomputer\user%gt and press ENTER.
Confirm that a certificate template is properly configured
To confirm that an OCSP Response Signing certificate template is properly configured:
  1. Click Start, type certtmpl.msc, and press ENTER.
  2. Right-click the OCSP Response Signing template, and then click Properties.
  3. Click the Security tab.
  4. Under Group or user name, click Add.
  5. Click Object Types, select the Computers check box, and click OK.
  6. Type the name of or browse to select the computer hosting the Online Responder or Online Certificate Status Protocol (OCSP) responder services, and then click OK.
  7. In the Group or user names dialog box, click the computer name.
  8. In the Permissions dialog box, select the Read, Enroll, and Autoenroll check boxes, and then click OK.
Confirm that a certificate template is available to a CA
To publish a certificate template:
  1. Click Start, point to Administrative Tools, and click Certification Authority.
  2. In the console tree, right-click Certificate Templates, click New, and then click Certificate Template to Issue.
  3. Select the certificate template, and click OK.
If renewal of the OCSP Response Signing certificate is successful but the certificate cannot be used by the Online Responder service, it is possible that security on the certificate has been misconfigured. By default, the Online Responder service runs as NETWORK SERVICE, so the private key must be accessible by this user context.
Confirm access to the OCSP Response Signing certificate by NETWORK SERVICE
Caution : Incorrectly editing the registry might severely damage your system. Before making changes to the registry, you should back up any valued data.
Modify the certificate renewal reminder period
Note : The reminder duration is an Online Responder-wide property, expressed as a percentage of the certificate lifetime. The default value is 90 percent of the certificate lifetime, but this value can be modified in the registry.
Reference LinksEvent ID 25 from Source Microsoft-Windows-OnlineResponder

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