VPN concentrator overloads at peak (8:30 am login storm).
A VPN concentrator has three limits: licenses (concurrent tunnels), CPU (crypto), bandwidth. At login peak all three hit at once. If a provider blip at 8:00 forces everyone to reconnect at 8:30, you are guaranteed a storm.
Try this first
- 1Check which limit hits hardest: license counter, CPU graph, or bandwidth.
- 2Scale the concentrator or add a second instance, load-balance via DNS round-robin or GTM.
- 3Find silent users (always connected, no traffic), tighten idle disconnect.
- 4For cloud VPN, scale the upstream/downstream link too, otherwise the concentrator is fine but the link saturates.
When to bring us in
Concentrator is end-of-life or the license costs more than a ZTNA subscription: compare cost and plan migration, hardware VPN for 50+ users is rarely the cheapest option anymore.
See also
- VPN will not connect or keeps droppingTwo main causes: your home internet or the VPN server. One quick test separates them.
- VPN connects but corporate folders are unreachableConnection says "green" but your network drives will not open. Almost always a DNS or routing issue.
- Home PC slow on VPN, fast at the officeThree suspects: home internet, VPN server limits, or routing that takes a long detour.
None of the above fits?
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