"Nigel Bishop" <Nigel.Bishop@xxxxxxxx> writes: > In the PG log file the errors were: > 2006-08-03 21:49:18 BST FATAL: invalid frontend message type 50 > 2006-08-03 21:49:18 BST LOG: unexpected EOF on client connection > 2006-08-03 21:49:18 BST LOG: unexpected EOF on client connection These look to me like your client(s) having a problem, not the server. Or as you say it could have been a network hiccup. I think the SHMMAX setting was unrelated, and had your operator not insisted on waving a dead chicken by rebooting the database, you'd still not know that someone had changed SHMMAX ... regards, tom lane