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“Troubleshoot DoSGuard Error 18456 State 113 and Stop Rejected Connections”

What is DoSGuard?
DoSGuard or Denial of Service Guard is a service provided by Microsoft for Azure database services. DoSGuard is a service that helps protect against malicious attacks such as DDoS (Distributed Denial of Service) attacks. It works by monitoring the incoming and outgoing traffic of a database service and blocking requests that are seen as malicious. This helps to protect the database from being overwhelmed by the malicious traffic.What is Error 18456?
Error 18456 is an error message that is displayed when a connection attempt to a database service has been blocked by DoSGuard. This error message indicates that the connection attempt was rejected by DoSGuard due to the incoming traffic being seen as malicious.What Causes Error 18456?
Error 18456 is caused by the incoming traffic being seen as malicious by DoSGuard. This can be caused by a variety of things such as DDoS attacks, malicious scripts, or other malicious activities.How to Troubleshoot Error 18456?
When troubleshooting Error 18456, the first step is to determine the source of the malicious traffic. This can be done by looking at the traffic logs of the database service. The traffic logs will show the source IP address of the malicious traffic. Once the source of the malicious traffic has been identified, steps can be taken to block the traffic from the source IP address.Conclusion
Error 18456 is an error message that is displayed when a connection attempt to a database service has been blocked by DoSGuard. This error message indicates that the connection attempt was rejected by DoSGuard due to the incoming traffic being seen as malicious. When troubleshooting Error 18456, the first step is to determine the source of the malicious traffic. This can be done by looking at the traffic logs of the database service and taking steps to block the traffic from the source IP address. As a Cloud Architect, it is important to understand the potential risks of malicious traffic and how to protect against them.
References:
Connections rejected by DoSGuard (error 18456 state 113)
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1. Error 18456 State 113
2. DoSGuard Connection Issues

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