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A lowercase "none" should not be present there. A value of "None" (note the uppercase "N") is automatically added to the drop-down selector list for each SID modification list file (Enable, Disable, Modify, Drop, Reject). See the code in /usr/local/www/suricata/suricata_sid_mgmt.php .

Upon saving on the SID MGMT tab, when the selection "None" is detected as the choice in the drop-down selector, the corresponding entry in config.xml is unset (deleted).

If the lowercase value was somehow manually entered, that would explain the error as "None" would not equal "none" during the save comparison and thus the config.xml entry would receive the value "none". Since no actual list exists with that name, the subsequent error is expected.

I can modify the existing PHP code to perform a case insensitive comparison, but I am still curious where the lowercase "none" originated. Can you shed additional light on that? Was this reported from a customer using a non-English locale?

I will investigate further and get a fix submitted to address this.

A fix for this issue has been posted in Pull Request #1208 against DEVEL posted here: https://github.com/pfsense/FreeBSD-ports/pull/1208.

This issue can be marked resolved when the pull request is merged.