ngrok limits the number of inbound connections to your tunnel endpoints. Limits are imposed on connections, not requests. If your HTTP clients use persistent connections aka HTTP keep-alive (most modern ones do), you'll likely never hit this limit. ngrok will return a 429 response to HTTP connections that exceed the rate limit.
The number of key vaults with private endpoints enabled per subscription is an adjustable limit. The limit shown below is the default limit. If you would like to request a limit increase for your service, please send an email to email@example.com.
Private Tunnel currently listens on UDP port 1194 and TCP port 443. Tunnel Device: What operating mode your Access Server is operating on. Tunnel UDP MSS-Fix: Whether to limit the TCP MSS values to fit the tunnel MTU. Select Disableunless instructed by our support staff. What does the concurrent user limit mean? | OpenVPN
Dynamic Multipoint VPN Configuration Guide, Cisco IOS
A license key contains a limit for the maximum number of users that may simultaneously connect to the VPN. This limit does not apply to the Client Web Server or Admin Web UI; only the number of concurrent VPN users is limited by the license. Android VpnService - 简书 Android VpnService 安卓系统提供了一个VpnService，可以用来开通一个VPN代理。使用这个代理，基础的可以用来统计或者监控，甚至可以拦截修改报文等。 这里只简单的把VpnService的使用记录一下。 TunnelBear: Secure VPN Service