Line colours are based on the last cause code reported by RADIUS which depends on whether the line is on-line or off line and why.
The cause codes are defined by the standard (RFC2866) and do not always fit all circumstances.
| Logged in | Line is logged in, no error |
| User Request | PPP restart or termination from far end, or L2TP session close from far end |
| Lost Carrier | LCP echo timeout |
| Lost Service | L2TP session close with specific message indicating loss of sync |
| Idle Timeout | Used to indicate a lost session, e.g. NAS crash |
| Session Timeout | Session timeout reached (normally after one hour on a blocked login) |
| Admin Reset | Manual or remote session or tunnel termination |
| Admin Reboot | LNS reboot or other RADIUS accounting issue |
| Port Error | L2TP relay failure, or L2TP tunnel level close |
| NAS Error | Any unknown internal error in LNS including no negotiation slots (too busy) |
| NAS Request | Session steering (directed to different LNS) |
| NAS Reboot | Not used |
| Port Unneeded | Try another response on RADIUS (steering) |
| Port Pre-empted | Same login twice. As login is based on circuit ID this is not normally seen. |
| Port Suspended | Line dropped because of an attack |
| Service Unavailable | RADIUS timeout |
| Callback | Not used |
| User Error | Any sort of PPP negotiation failure, or an authentication failure and also some L2TP negotiation errors |
| Host Request | Not used |
| Blocked | Line is logged in but blocked due to bad password or blocked login |
| Invalid | Line not valid (not installed, or is ceased) |