On Tue, Sep 29, 2020 at 04:22:32PM +0200, to...@tuxteam.de wrote: Following up on myself: I had exactly this case with an (outsourced) data centre: they had NATs between different realms (you might ask "why, oh, why?" and you'd be right). The application server and the database server were separated by a NAT. To add insult to injury, ICMP "not reachable" packets were filtered. The database connection NAT entry timed out from time to time. It took a timeout of several minutes for the application to notice that and to reconnect.
Lots of hilarity ensued. Setting the socket option to keep alive "fixed" that. Cheers - t
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