Last Modified: Jul 15, 2026
Affected Product(s):
F5OS F5OS, F5OS-A, F5OS-C
Fixed In:
F5OS v2.0.0
Opened: May 28, 2025 Severity: 4-Minor
When a network capture (tcpdump) is running on the management interface and the underlying diagnostic service is restarted, the tcpdump session does not terminate gracefully. Instead of exiting with a clear status and packet summary, the command ends with an “application communication failure” message, providing no proper indication that the diagnostic service was restarted.
The tcpdump session terminates with an “application communication failure” instead of a clear, informative message and packet summary. This can mislead administrators into suspecting a network or application issue, complicate troubleshooting, and require them to rerun captures to obtain complete diagnostic data.
This issue occurs when a tcpdump capture is running on the management interface and the underlying diagnostic service responsible for tcpdump is restarted while the capture is still in progress.
None
When a tcpdump capture is running on the management interface and the underlying diagnostic service is restarted, the tcpdump session now terminates gracefully. The command exits with a clear, informative message indicating that the diagnostic service was restarted and provides the expected packet summary, instead of reporting an “application communication failure.”