| Event Id | 21163 |
| Source | ISA Server H.323 Filter |
| Description | The Firewall service detected that the demand dial interface %1 was assigned an IP address from network %2. This may indicate a configuration error. |
| Event Information | According To Microsoft: This event occurs when the specified VPN site-to-site network adapter is assigned an IP address that is already included in another network. This may be an indication of a spoof attack. Resolution: Verify that the VPN configuration for the remote server is defined properly.Try to reestablish the connection and ensure that the connection is with the correct remote site. |
| Reference Links | Microsoft product: Internet Security and Acceleration Server Version: 4.0.3443.594 Event Source: ISA Server H.323 Filter Event ID: 21163 |
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