[Turnserver-users] is it a bug of turnserver?

[Zonesan <sa...@zo...>]

While a turnserver is running, a client get a success allocation and channel
binding.
Then client send data to channel. but about 3 mins later, servers response a
error code 438 which telling client a stale nonce error. Lifetime(and
time-to-expiry) has set to 600 seconds or more.
So... I'm not sure whether it is a bug or a feather of TURN/STUN.
Can anyone help me? thanks very much.
Best regards.