Log files polluted with permission denied error messages after every 10 seconds

Hi!

Postgres 13.1 is installed in windows server. There are about 100 users.

Log files contain huge number of permisson denied error messages in 
every day like :

2021-03-04 01:38:49.818 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 01:48:42.725 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 01:53:22.427 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 01:58:19.623 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 02:03:24.080 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 02:43:17.983 EET [7764] LOG:  invalid length of startup packet
2021-03-04 02:43:21.634 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 02:48:25.048 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 02:53:19.229 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 02:58:19.176 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 03:03:19.136 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 03:29:33.926 EET [2460] FATAL:  expected SASL response, got 
message type 0
2021-03-04 03:36:04.995 EET [4816] LOG:  could not rename temporary 
statistics file "pg_stat_tmp/global.tmp" to "pg_stat_tmp/global.stat": 
Permission denied
2021-03-04 03:36:09.666 EET [10340] LOG:  using stale statistics instead 
of current ones because stats collector is not responding
2021-03-04 03:53:20.036 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied
2021-03-04 04:03:19.001 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000001B": Permission denied

On middle of day where usage is intensive those appear exactly after 
every 10 seconds:

2021-03-05 12:08:40.001 EET [4580] LOG:  could not rename file 
"pg_wal/000000010000000500000078": Permission denied
2021-03-05 12:08:50.059 EET [4580] LOG:  could not rename file 
"pg_wal/00000001000000050000007D": Permission denied
2021-03-05 12:09:00.115 EET [4580] LOG:  could not rename file 
"pg_wal/000000010000000500000082": Permission denied
2021-03-05 12:09:10.171 EET [4580] LOG:  could not rename file 
"pg_wal/000000010000000500000088": Permission denied
2021-03-05 12:09:20.224 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000A4": Permission denied
2021-03-05 12:09:30.281 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000A8": Permission denied
2021-03-05 12:09:40.339 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000B0": Permission denied
2021-03-05 12:09:50.397 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000E7": Permission denied
2021-03-05 12:10:00.456 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000E8": Permission denied
2021-03-05 12:10:10.514 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000E9": Permission denied
2021-03-05 12:10:20.570 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000EB": Permission denied
2021-03-05 12:10:30.626 EET [4580] LOG:  could not rename file 
"pg_wal/0000000100000005000000EC": Permission denied

How to fix this ?

It looks like database is working normally, users havent reported any 
issues.

Andrus.