Security Error: Invalid parent

[HMStacy]

We have this error on direct admin csf install:

Security Error: Invalid parent
Information saved to [/var/lib/csf/da1709071834.error]

Contents of /var/lib/csf/da1709071834.error:

To disable DirectAdmin session checks, create a touch file called /var/lib/csf/csf.da.skip

Security Error: Invalid parent

Session ID = [DNT62UZGPI52D5GCOC6URRCKC73SMQQXO37I7VI]
Session File [/usr/local/directadmin/data/sessions/da_sess_DNT62UZGPI52D5GCOC6URRCKC73SMQQXO37I7VI]...exists.

Environment data:
REMOTE_ADDR = [64.178.234.162]
SESSION_KEY = [GBM6HWJHMCCLMWN5LDWDRDERPPPRL2K6FCNWOEI]
SESSION_ID = [DNT62UZGPI52D5GCOC6URRCKC73SMQQXO37I7VI]

Session data:
ip = []
key = []

Session file contents:

Touch file already exists.

MSFE and eXploit Scanner also show "Security Error: Invalid parent" without referencing an error file.
Mail Queue works without issue.

Things already tried:

- restarting csf
- reinstalling csf
- DA updates
- logging in and out again
- different browser
- accessing from cell phone/network (same problem)