I wonder if this is a more general TCP/IP issue rather than anything Postgres specific. I'm troubleshooting an issue where a TCP connection to a server is unexpectedly going down, once in a while, with no obvious indication. The solution, for now, is to have the client send a sort of ping over the TCP connection to the server every so often and then establish a new connection if it doesn't get a response. In other words, when the connection goes down, trying to send something over it from the client does not generate an error. I haven't found an indication on either the client or server. So, to detect the connection failure, you have to look for a lack of response. This is an intermittent failure and, as such, very annoying to troubleshoot.
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