Per my examination of syslog:
Oct 7 13:20:08 vpshost20 pveproxy[2691]: worker 13503 finished
Oct 7 13:20:08 vpshost20 pveproxy[2691]: starting 1 worker(s)
Oct 7 13:20:08 vpshost20 pveproxy[2691]: worker 13506 started
Oct 7 13:20:08 vpshost20 pveproxy[13506]: /etc/pve/local/pve-ssl.key: failed to load local private key (key_file or key) at /usr/share/perl5/PVE/HTTPServer.pm line 1623
Oct 7 13:20:12 vpshost20 pveproxy[2691]: worker 13504 finished
Oct 7 13:20:12 vpshost20 pveproxy[2691]: starting 1 worker(s)
Oct 7 13:20:12 vpshost20 pveproxy[2691]: worker 13513 started
Oct 7 13:20:12 vpshost20 pveproxy[13513]: /etc/pve/local/pve-ssl.key: failed to load local private key (key_file or key) at /usr/share/perl5/PVE/HTTPServer.pm line 1623
Oct 7 13:20:12 vpshost20 pvestatd[2686]: WARNING: ipcc_send_rec failed: Connection refused
Oct 7 13:20:12 vpshost20 pvestatd[2686]: WARNING: ipcc_send_rec failed: Connection refused
Oct 7 13:20:12 vpshost20 pvestatd[2686]: WARNING: ipcc_send_rec failed: Connection refused
Oct 7 13:20:12 vpshost20 pvestatd[2686]: WARNING: ipcc_send_rec failed: Connection refused
Oct 7 13:20:12 vpshost20 pvestatd[2686]: WARNING: ipcc_send_rec failed: Connection refused
Oct 7 13:20:12 vpshost20 pvestatd[2686]: WARNING: ipcc_send_rec failed: Connection refused
Oct 7 13:20:13 vpshost20 pveproxy[2691]: worker 13505 finished
Oct 7 13:20:13 vpshost20 pveproxy[2691]: starting 1 worker(s)
Oct 7 13:20:13 vpshost20 pveproxy[2691]: worker 13515 started
Oct 7 13:20:13 vpshost20 pveproxy[13515]: /etc/pve/local/pve-ssl.key: failed to load local private key (key_file or key) at /usr/share/perl5/PVE/HTTPServer.pm line 1623
Oct 7 13:20:13 vpshost20 pveproxy[2691]: worker 13506 finished
Oct 7 13:20:13 vpshost20 pveproxy[2691]: starting 1 worker(s)
Oct 7 13:20:13 vpshost20 pveproxy[2691]: worker 13516 started
Oct 7 13:20:13 vpshost20 pveproxy[13516]: /etc/pve/local/pve-ssl.key: failed to load local private key (key_file or key) at /usr/share/perl5/PVE/HTTPServer.pm line 1623