getaddrinfo failed: Servname not supported for ai_socktype

[David Woodhouse]

On Sun, 2010-08-08 at 22:24 -0500, Matthew Kitchin (public/usenet)
wrote:
> 
> How does it handle failed network connections? Does it try and 
> reconnect, or should I put in a cron job that checks a ping and then 
> restarts the connection if it is down? 

It'll detect a broken connection, for both CSTP (HTTP/TCP) and DTLS
(UDP) connections. Usually it has *both* open at the same time, and will
be passing data over the latter while the former is *only* doing
keepalives.

Whenever it hasn't heard anything from the server for 30 seconds¹ on a
given connection, it'll send a Dead Peer Detection (DPD) frame. If it
doesn't receive a response within another 30 seconds, it'll tear down
the connection and reconnect.

It can reconnect as many times as it likes, even from different IP
addresses (if you suspend, move somewhere else and resume, etc.).

It doesn't need to reauthenticate, because the HTTP 'webvpn' cookie
remains valid for the lifetime of the session and can just be reused.

See the --reconnect-interval and --reconnect-timeout options to tweak
the way it responds to network outages. By default, it'll try to
reconnect the CSTP connection every 10 seconds, and give up completely
after 5 minutes. If it's the DTLS connection which gets lost, it just
falls back to passing traffic over the CSTP connection while it attempts
to connect DTLS.

-- 
dwmw2

¹ That number is taken from your server configuration, which you showed
  when you posted the debug log.