| Event Source: | Microsoft-Windows-OnlineResponderWebProxy |
| Event ID: | 21 (0x15) |
| Event log: | Application |
| Event type: | Error |
| Event text (English): | The Online Responder web proxy did not process an extremely long request from %1. This may indicate a denial-of-service attack. If the request was rejected in error, modify the MaxIncomingMessageSize property for the service. This error will only be logged every 20 minutes. |
| Event text (German): | The online responder web proxy has not processed a very long request from %1. This may be an indication of a denial of service attack. If the request was incorrectly denied, change the "MaxIncomingMessageSize" property for the service. This error is logged every 20 minutes. |
Parameter
The parameters contained in the event text are filled with the following fields:
- %1: RequesterName (win:UnicodeString)
The Online Responder (Online Certificate Status Protocol, OCSP) is an alternative way of providing revocation status information for certificates. Entities that want to check the revocation status of a certificate do not have to download the complete list of all revoked certificates thanks to OCSP, but can make a specific request for the certificate in question to the online responder. For a more detailed description, see the article "Basics Online Responder (Online Certificate Status Protocol, OCSP)„.
Description
Do you know TameMyCerts? TameMyCerts is an add-on for the Microsoft certification authority (Active Directory Certificate Services). It extends the function of the certification authority and enables the Application of regulationsto realize the secure automation of certificate issuance. TameMyCerts is unique in the Microsoft ecosystem, has already proven itself in countless companies around the world and is available under a free license. It can downloaded via GitHub and can be used free of charge. Professional maintenance is also offered.
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Safety assessment
The security assessment is based on the three dimensions of confidentiality, integrity and availability.
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Related links:
- Overview of Windows events generated by the online responder (OCSP)
- Overview of the audit events generated by the online responder (OCSP)
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