Bug ID 705768: The dynconfd process may core and restart with multiple DNS name servers configured

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:,,,,, 12.1.4,, 12.1.5,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1

Fixed In:
16.0.0, 15.1.2,,,

Opened: Feb 07, 2018

Severity: 2-Critical


The dynconfd daemon may crash with a core and restart when processing a DNS query when there are multiple DNS name servers configured, or when the list of DNS name servers is changed.


Resolution of FQDN names for FQDN nodes and pool members may be briefly interrupted while the dynconfd daemon restarts. This may cause a delay in propagation of DNS zone changes to the BIG-IP configuration.


This may occur rarely when FQDN nodes are configured and multiple DNS name servers are configured, including when a name server is added to or removed from the system DNS configuration while a DNS query is active.


This issue occurs rarely. There is currently no known workaround.

Fix Information

The dynconfd process no longer cores and restarts with multiple DNS name servers configured.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips