Bug ID 805017: DB monitor marks pool member down if no send/recv strings are configured

Last Modified: Sep 13, 2023

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

Known Affected Versions:
12.1.5,,, 14.1.2,,,,,,,,, 14.1.3, 15.0.0, 15.0.1,,

Fixed In:

Opened: Jul 13, 2019

Severity: 3-Major


If an LTM database monitor type (MySQL, MSSQL, Oracle or PostgreSQL database monitor type) is configured without a 'send' string to issue a user-specified database query, pool members using this monitor are marked DOWN, even though a connection to the configured database completed successfully.


With this configuration, the monitor connects to the configured database, but does not issue a query or check for a specific response. Pool members are always marked DOWN when using a database monitor with no 'send' string configured.


-- AnLTM pool or pool members are configured to us an LTM database (MySQL, MSSQL, Oracle or PostgreSQL) monitor type. -- No send string is configured for the monitor.


To work around this issue, configure 'send' and 'recv' strings for the database monitor that will always succeed when successfully connected to the specified database (with the configured username and password, if applicable).

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips