[Openswan Users] Connection over IPSec times out after exactly 15 minutes

Paul Wouters paul at xelerance.com
Wed Oct 5 11:31:09 EDT 2011

On Tue, 4 Oct 2011, Kevin Keane wrote:

> Recently, I started using an IPSec tunnel (openswan to a Sonicwall
> device) instead - for now only on one of the servers. Ever since,
> backups of this one server started failing after exactly 15 minutes. The
> error message is, on both sides, Connection reset by peer.

If this is an openswan error, there should be more logs from pluto about the
cause of the tunnel failing.

> I already asked on the bacula mailing list; somebody there pointed me to
> tcpmss clamping. As I was reading up on it, it didn't sound like it was
> my problem (it doesn't seem to explain why data flows fine for 15
> minutes, and then suddenly stops), but I have to admit that I don't
> fully understand it.

that's right, you would see traffic flow problems immediately.


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