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The error “503: Too Many Connections For Client-Username” occurs when you’ve reached the maximum number of allowed connections for a specific client username configured in the client profile. This is different from hitting the Message VPN connection limit or the broker’s system-wide connection limit.
There are two potential solutions:
- Increase the maximum connections allowed per username in the client profile configuration
- Review and remove unnecessary client connections that may be consuming the connection quota
To diagnose the issue:
- Check the event logs for entries containing “VPN_CLIENT_USERNAME_CONNECTIONS”
- Monitor the active number of connections for the specific username
- Look for potential connection spikes around the time of the error
The error can manifest differently depending on what limit is reached:
- Username limit: “503: Too Many Connections For Client-Username”
- VPN limit: “503: Too Many Connections For VPN”
- System limit: “503: Too Many Clients”
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