Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.6.0, 11.6.0 hf1, 11.6.0 hf2, 11.6.0 hf3, 11.6.0 hf4, 11.6.0 hf5, 11.6.0 hf6, 11.6.0 hf7, 11.6.0 hf8, 11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3
Fixed In:
12.0.0
Opened: Nov 04, 2014 Severity: 3-Major Related Article:
K16631
SMTP monitor on non-default route domain fails to create socket
SMTP monitor pool members are DOWN. If debug logging is enabled for the monitor, the system posts messages in the monitors debug log: Notice 'ERROR: failed to connect 10.50.1.100%20:25 error: couldn't open socket: host is unreachable'.
SMTP monitors on a non-default route domain.
Create an External monitor using SMTP_monitor.
SMTP monitor no longer fails when using a non-default route domain.