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You may face ones of these problems while activating changes. The exact error message might look different, but this article might still apply.

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One of these error messages might apply to you:

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The site is currently locked by another activation process. 

Please try again later.

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1. Log into your central Checkmk site as an administrative user and navigate to Background jobs.
   
   
2. Check the section titles Activate Changes Scheduler for running jobs, which are older than a few minutes.
   
   
3. Take note of the UUID at the end of the job name (activate-changes-scheduler-263383ff-b58b-4a8e-ba77-c6e1ff2d3b94).

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1. Login to your central site as the site user

   Code Block
   language bash theme RDark
   root@linux:~# omd su mysite

   
   .

2. Check to see if you have old directories within $OMD_ROOT/tmp/check_mk/wato/activation/
   

   Code Block
   language bash theme RDark
   OMD[mysite]:~$ ls -lah $OMD_ROOT/tmp/check_mk/wato/activation/ total 42 drwxrwx--- 3 mysite mysite 100 Jul 4 00:42 6ecd4860-611e-4a4c-912f-74a6f1123e99/ drwxrwx--- 3 mysite mysite 100 Jul 4 00:42 bec06bbc-1d35-4668-a421-151828b8500d/ drwxrwx--- 3 mysite mysite 920 Jul 3 18:34 263383ff-b58b-4a8e-ba77-c6e1ff2d3b94/

   It looks like there is one old directory that couldn't be deleted. The files here are deleted every minute by default.

   
   .

3. Remove the lingering directory:

   Code Block
   language bash theme RDark
   OMD[mysite]:~$ rm -r $OMD_ROOT/tmp/check_mk/wato/activation/263383ff-b58b-4a8e-ba77-c6e1ff2d3b94/

   
   .

4. There will be a corresponding background job in $OMD_ROOT/var/check_mk/background_jobs/, which can be cleaned up as well:

   Code Block
   language bash theme RDark
   OMD[mysite]:~$ ls -lah $OMD_ROOT/var/check_mk/background_jobs/ total 42 drwx------ 2 hydemysite hydemysite 4.0K Jul 4 00:42 activate-changes-scheduler-0897307d-d177-4b6e-a500-1263a5ec3299/ drwx------ 2 hydemysite hydemysite 4.0K Jul 4 00:42 activate-changes-scheduler-1ba662c2-374a-4bce-9b6a-59329e9f11a5/ drwx------ 2 hydemysite hydemysite 4.0K Jul 3 18:34 activate-changes-scheduler-263383ff-b58b-4a8e-ba77-c6e1ff2d3b94/ OMD[mysite]:~$ rm -R $OMD_ROOT/var/check_mk/background_jobs/activate-changes-scheduler-263383ff-b58b-4a8e-ba77-c6e1ff2d3b94/

   
   .

5. Now go back to the UI and try to activate changes.

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