Network Timeout 15 seconds on starting or stopping a VM

Oct 10, 2021
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Virtual Environment 6.4-13 Cluster (x4 nodes)

Using NGINX VM as a reverse proxy for VMs on private address space (VMBR1)
The issue is that starting and stopping any VM on the node with the Proxy causes all VMs to have a network timeout of circa 15 seconds before connecting as expected again.

Would there be any particular reason for this and is there anything that can be changed or set ?

Package versions:
proxmox-ve: 6.4-1 (running kernel: 5.4.151-1-pve) pve-manager: 6.4-13 (running version: 6.4-13/9f411e79) pve-kernel-5.4: 6.4-10 pve-kernel-helper: 6.4-10 pve-kernel-5.4.151-1-pve: 5.4.151-1 pve-kernel-4.15: 5.4-19 pve-kernel-4.15.18-30-pve: 4.15.18-58 pve-kernel-4.15.18-10-pve: 4.15.18-32 ceph: 14.2.22-pve1 ceph-fuse: 14.2.22-pve1 corosync: 3.1.2-pve1 criu: 3.11-3 glusterfs-client: 5.5-3 ifupdown: 0.8.35+pve1 ksm-control-daemon: 1.3-1 libjs-extjs: 6.0.1-10 libknet1: 1.20-pve1 libproxmox-acme-perl: 1.1.0 libproxmox-backup-qemu0: 1.1.0-1 libpve-access-control: 6.4-3 libpve-apiclient-perl: 3.1-3 libpve-common-perl: 6.4-4 libpve-guest-common-perl: 3.1-5 libpve-http-server-perl: 3.2-3 libpve-storage-perl: 6.4-1 libqb0: 1.0.5-1 libspice-server1: 0.14.2-4~pve6+1 lvm2: 2.03.02-pve4 lxc-pve: 4.0.6-2 lxcfs: 4.0.6-pve1 novnc-pve: 1.1.0-1 openvswitch-switch: 2.12.3-1 proxmox-backup-client: 1.1.13-2 proxmox-mini-journalreader: 1.1-1 proxmox-widget-toolkit: 2.6-1 pve-cluster: 6.4-1 pve-container: 3.3-6 pve-docs: 6.4-2 pve-edk2-firmware: 2.20200531-1 pve-firewall: 4.1-4 pve-firmware: 3.3-2 pve-ha-manager: 3.1-1 pve-i18n: 2.3-1 pve-qemu-kvm: 5.2.0-6 pve-xtermjs: 4.7.0-3 qemu-server: 6.4-2 smartmontools: 7.2-pve2 spiceterm: 3.1-1 vncterm: 1.6-2 zfsutils-linux: 2.0.6-pve1~bpo10+1
 
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