Port 8082 lots of TIME_WAIT connections

Seafile Server
1

Hi,
after upgrading our pro server to 6.3.12 on Scientific Linux 7.6 I see more than 500 waiting connections on localhost port 8082

tcp        0      0 127.0.0.1:8082          127.0.0.1:42938         TIME_WAIT
tcp        0      0 127.0.0.1:8082          127.0.0.1:43594         TIME_WAIT
tcp        0      0 127.0.0.1:8082          127.0.0.1:42618         TIME_WAIT
tcp        0      0 127.0.0.1:8082          127.0.0.1:42804         TIME_WAIT
tcp        0      0 127.0.0.1:8082          127.0.0.1:43336         TIME_WAIT

I’m using nginx as a proxy as described in the manual

 location /seafhttp {
  rewrite ^/seafhttp(.*)$ $1 break;
  proxy_pass http://127.0.0.1:8082;
  proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
}

SELinux is in permissive mode. The seafile server is running fine, all clients are working as expected. I don’t see any errors in the log files. Even when I disable iptables, the connections won’t disappear. So I wonder, where these waiting connection are from.

Any ideas?
Thanks.
Dirk