GROUP: IP address pool depleted

[chort1]

We have multiple OpenVPN Access servers running, but on just one of them, some users are having trouble logging in, and I see this message in the logs
GROUP: IP address pool depleted

This only seems to happen on the most active server, but there are still only about 100 logged in users and the client pool is /21, so there should be enough IPs to go around. I have not configured any per-group client pools either, so everyone is using the default pool.

What else can I check?

[chort1]

Ok, so I've figured out that each group comes with a default subnet mask of /27, which means that no more than 32 (or 30?) users in the same group can log in at the same time. We've specified a /21 subnet as the default group pool. Is the per-group-pool generated in a specific ratio compared the default group, or can it be manually reconfigured?

[chort1]

Seems the size is calculated automatically based on the group pool and the amount of groups
Case closed