Hey yeah, keys look right. That is the reason players get kicked. No other error at that time.
Woke up this morning to a server side crash with an error "warning: preNLOD format in object cst\cst_veg\misc\misc_stub2.p3d"
Not sure if my server side has a dodgy download though.. will re DL the content fro armaholic to confirm.
Edit: re DL from armaholic fixed it. Orginal server side DL was from workshop. Must have been a once off as clients are all workshop and they are fine now. Thanks