Explore the latest product updates and best practices at our hybrid Checkmk Conference #12 from June 16-18, 2026 – Register here

Werk #6530: Fixed possible error "You can not override a builtin auxiliary tag" after update

Component User interface
Title Fixed possible error "You can not override a builtin auxiliary tag" after update
Date Sep 3, 2018
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
1.5.0p3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

During the tag migration from 1.5 or newer a problem could happen that the auxiliary tags "snmp" and "tcp" were not removed correctly. This happened when the titles of these auxiliary tags have been changed in the site.

This is a regression since 1.5.0p1 (caused by #6247).

Workaround with 1.5.0p2 or older: Have a look at the /omd/sites/[SITE]/etc/check_mk/multisite.d/wato/hosttags.mk file. First create a backup of this file, then look for entries like this:

wato_aux_tags += \ [('snmp', u'monitor via SNMP'), ('tcp', u'monitor via Check_MK Agent')]

Try to remove the line and reload the GUI. The issue should be gone now.

To the list of all Werks