From OpenSCADAWiki
On this tab, you can:
- Familiarize the active authentication sessions.
- Specify life time of the authentication sessions, in minutes.
- Specify a connection limit for one user from one host.
- Specify the compression level and lower limit. Where range of the compression level is from 0 to 9 (0 - disable the compression, -1 - optimal compression level in performance and quality) and the lower limit is a threshold for the compression using and turning its off at small requests.