_No STUN nodes available._

**Problem:** This is shown if no STUN-capable nodes are available. Coder will

use STUN to establish [direct connections](../networking/stun.md). Without at

least one working STUN server, direct connections may not be possible.

**Solution:** Ensure that the

[configured STUN severs](../cli/server.md#derp-server-stun-addresses) are

reachable from Coder and that UDP traffic can be sent/received on the configured

port.

_Mapping varies based on destination IP. You may be behind a hard NAT._

**Problem:** This is a warning shown when multiple attempts to determine our

public IP address/port via STUN resulted in different `ip:port` combinations.

This is a sign that you are behind a "hard NAT", and may result in difficulty

establishing direct connections. However, it does not mean that direct

connections are impossible.

**Solution:** Engage with your network administrator.