Last Modified: Jun 28, 2025
Affected Product(s):
BIG-IP DNS
Known Affected Versions:
16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.5.0
Fixed In:
17.5.1
Opened: Mar 17, 2025 Severity: 3-Major
When a virtual server object, which is managed by a remote LTM device, is disabled, after gtmd is restarted (or GTM/DNS device reboot) and gtmd becomes online and iQuery communication is re-established with the remote LTM device, the bellow message is logged to /var/log/gtm and virtual server status becomes "offline/disabled" (black diamond icon). gtmd[xxxx]: 011ae0f2:1: Monitor instance /Common/bigip 10.1.1.201:80 CHECKING --> DOWN from /Common/bigipdns (no reply from big3d: timed out) gtmd[xxxx]: 011a6006:1: SNMP_TRAP: virtual server /Common/vs1 (ip:port=10.1.1.201:80) (Server /Common/bigipltm) state change blue --> red ( Monitor /Common/bigip : no reply from big3d: timed out: disabled directly) Then, even after re-enabling the virtual server, which is managed by LTM, virtual server stays as "offline/enabled" (red diamond icon) with "Monitor /Common/bigip : no reply from big3d: timed out" message. ---------------------------------- | Gtm::Virtual Server: vs1 ---------------------------------- | Status | Availability : offline | State : enabled | Reason : Monitor /Common/bigip : no reply from big3d: timed out | Destination : 10.1.1.201:80 | Up Time : ---
Virtual server stays as unavailable despite the remote LTM device reporting virtual server status as 'up'. Hence, pool or wideIP, which uses the affected server object, may be unavailable too.
All of the following conditions met. - GTM/DNS device manages remote LTM device and its virtual server. - Remote LTM virtual server is not directly monitored by GTM/DNS device monitor object. Instead, remote LTM virtual server is monitored by remote LTM device itself (e.g., on remote LTM device, virtual server pool is monitored by pool monitor). - On GTM/DNS device, disable and re-enable virtual server, which is managed by remote LTM device. - After virtual server is disabled on GTM/DNS device, gtmd restart on GTM/DNS device or GTM/DNS device reboots. - GTM/DNS is running on a software versions 17.1.1 or 16.1.5 or later versions in which the ID 1133201 is fixed.
If issue had already occurred and virtual server stayed as "offline/enabled" (red diamond icon), restarting gtmd on GTM/DNS device will rescue the affected virtual server. If issue does not yet occur but virtual server is going to be disabled and re-enabled, you can prevent issue by changing "DNS >> Settings : GSLB : General - Monitor Disabled Objects" setting (gtm global-settings general monitor-disabled-objects) to "yes" (default "no"). This needs to be done prior to disabling virtual server (prior to gtmd restart/reboot). # tmsh modify gtm global-settings general monitor-disabled-objects yes # tmsh save sys config gtm-only
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