If you want to clean your TRFC_IN and TRFC_OUT entries according to your RZ20 warnings or 3rd party checking tools informations then you can easily follow the below steps..
For an example , situation of our SAP systems TRFC_IN & TRFC_OUT status ;
First of all we should goto “Transactional RFC” page
TCODE –> SM58
Select the time frame (my suggestion for yesr from 1000 to 3000) , insert * to all other areas and execute
Goto –> Log File –> Reorganize
Select the time frame again and check all the boxes below and execute
After the process you will see the result bottom of the page
Now all TRFC_IN entries are clear.
Continue with TRFC_OUT entries.
Goto –> SE38 –> RSTRFCER
Fill the related areas like below
Now you will see the result of the process
Last of all , you won’t get any TRFC_IN and TRFC_OUT messages at all…