Hi Team, I know this is has been answered a lot on the internet wrt ignoring, but i am unable to figure out why I get these messages in logs "incomplete startup packet" I have a server running postgresql 10.5 on ubuntu16.04 i do not have any active external connections other than streaming postgres replication. postgres 7757 1 0 12:20 ? 00:00:00 /usr/lib/postgresql/10/bin/postgres -D /var/lib/postgresql/10/main -c config_file=/etc/postgresql/10/main/postgresql.conf postgres 7759 7757 0 12:20 ? 00:00:00 postgres: 10/main: checkpointer process postgres 7760 7757 0 12:20 ? 00:00:00 postgres: 10/main: writer process postgres 7761 7757 0 12:20 ? 00:00:00 postgres: 10/main: wal writer process postgres 7762 7757 0 12:20 ? 00:00:00 postgres: 10/main: autovacuum launcher process postgres 7763 7757 0 12:20 ? 00:00:00 postgres: 10/main: archiver process postgres 7764 7757 0 12:20 ? 00:00:00 postgres: 10/main: stats collector process postgres 7765 7757 0 12:20 ? 00:00:00 postgres: 10/main: bgworker: logical replication launcher postgres 7779 7757 0 12:20 ? 00:00:00 postgres: 10/main: wal sender process replicator x.x.x.x(47792) streaming 3/FA0001B0 postgres 7780 7757 0 12:20 ? 00:00:00 postgres: 10/main: wal sender process replicator x.x.x.x(50526) streaming 3/FA0001B0 postgres 7786 7757 0 12:21 ? 00:00:00 postgres: 10/main: wal sender process barman_streaming x.x.x.x(43566) streaming 3/FA0001B0 also, postgres=# select backend_type, query from pg_stat_activity; backend_type | query ---------------------+--------------------------------------------------- autovacuum launcher | background worker | walsender | walsender | walsender | client backend | select backend_type, query from pg_stat_activity; background writer | checkpointer | walwriter | but i still see tail -1000 /var/log/postgresql/postgresql-10-main.log| grep 'incomplete startup packet' 2018-11-01 13:04:18 UTC LOG: incomplete startup packet 2018-11-01 13:08:18 UTC LOG: incomplete startup packet 2018-11-01 13:12:18 UTC LOG: incomplete startup packet Note: exactly at 4 min interval. i do not know C, but i tried to understand something from https://github.com/postgres/postgres/blob/197e4af9d5da180190a0f2be851b095dba57d9cd/src/backend/postmaster/postmaster.c#L1891 without any active connections, i would rule any driver issue out. i do not have ssl enabled, but not using it. I tried disabling it too. postgres=# show ssl; ssl ----- off (1 row) I do not know, why those log messages are then showing up. not errors in ens160 Link encap:Ethernet HWaddr 00:50:56:a4:53:b6 inet addr:x.x.x.x Bcast:x.x.x.x Mask:x.x.x.x inet6 addr: xxxxx/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:45403371 errors:0 dropped:0 overruns:0 frame:0 TX packets:8834699 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6417380742 (6.4 GB) TX bytes:56209193635 (56.2 GB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:28985185 errors:0 dropped:0 overruns:0 frame:0 TX packets:28985185 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:7078785550 (7.0 GB) TX bytes:7078785550 (7.0 GB) Regards, Vijay