That's an odd timing to get that sort of an error...
What API client are you using? What is the code that results in this error? Are you connecting directly to the router, or over a VPN or SSH tunnel?
I can imagine several scenarios where this can happen, but none of them involve connecting directly to a router with any normal API client and immediatly catching errors specifically from that API client.
(1.0.0b6) - My API client in PHP
(Rate my posts? If you want... no pressure...)