The "Could not bind on a socket" error in the event logs of a ProxySG appliance indicates that a process or service is unable to bind to a specific port or socket due to conflicts, resource exhaustion, or misconfigurations.
ISG-Proxy/SG/ASG
Root Causes:
Port Conflict:
Resource Exhaustion:
Improper Configuration:
Firewall or System Restrictions:
View and analyze the active connections to determine if socket or resource exhaustion is causing the issue.
Command:
Look for:
Key Commands Summary
Task | Command |
---|---|
View event logs | show event-log |
Check active connections | show active-sessions |
Display interface configuration | show interface |
Test DNS resolution | test dns <hostname> |
Check system health and resources | show health -checks |
Restart the appliance | restart |
Resolution Path
show event-log
to confirm the specific service or port causing the binding issue.show active sessions
to identify stale or excessive sockets.If the Issue Persists
Collect the outputs of:
show event-log
show active-sessions
show health-
checksshow interface
Share the findings with Technical Support for further assistance.
Also, consider implementing the below as well.
Increase Maximum Number of Source Ports for the ProxySG Appliance
By default, the maximum number of source ports is 16,384. To ensure enough unique connections are available, use the following CLI command to increase the number of ports to the maximum possible for the appliance:
#(config) tcp-ip inet-lowport 16384
Note: The inet-lowport can be set as low as 1024. Setting the port lower than a listening port on the proxy can had adverse effects to regular proxy operations.
For further information, see the KB article: Recommended TCP source ports
Reduce the Amount of Time a TCP Connection is in the TIME_WAIT State
To reduce the amount of time a TCP connection is in the TIME_WAIT state, use the following CLI command:
#(config) tcp-ip tcp-2msl 30
Note: For other devices in your network, such as firewalls, ensure that the TCP TIME_WAIT state value is not lower than the value you set for the ProxySG appliance.