Replying for myself:
I was looking for the network-timeout parameter.

On 2016-09-01 11:17, Laszlo Toth wrote:
Hi,

I have a problem with pdns-recursor. It looks like if the recursive
forwarder (that is set with the forward-zones-recurse parameter) is
taking longer than usual to respond the Recursor stops waiting for it.
My experiment showed this is 1 second. Is there a way to configure
this timeout? I have to use a couple of domains where the TTL is 30
(or 60 seconds) and their authoriative servers are very slow.

The error looks like this in tcpdump:

13:56:18.082578 IP pdns.server.local.30044 > dns1.resolv.to.domain:
39835+ A? example.com. (42)
13:56:19.737475 IP dns1.resolv.to.domain > odns.server.local.30044:
39835 1/0/0 A 1.2.3.4 (58)
13:56:19.737511 IP pdns.server.local > dns1.resolv.to: ICMP
pdns.server.local udp port 30044 unreachable, length 94

Thanks,
Laszlo
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