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Without any details of you config, then how can one help you? Also post your error message will help any one to help you.

Please update according to the Proxmox Manual.

Yes, possible. As long as no NODEs and VMs with same port.

In real world, things not always running fine. For example. When you execute STOP command, sometime the result is not Success, then your next DESTROY command will not success too (because you can not delete a running VM). That is why Proxmox API give us a return value for each command. Another...

Does your CSF running well before you upgrade Proxmox? If so, you must know that there are some changing on new OpenVZ version which affect CSF.

In Linux, Ping use ICMP while Traceroute use UDP. This is differ from Windows. Try to disable CSF.

I don't think so. In our network, we use EXISTING Mac from lists rather than generate new one. We need to use SAME Mac address because we binding it to IP according to DHCP.

You can set each Node and VM has different timezone. Also, each VM can be different timezone too. NB: each VM can be different NTP Server too.

PING and TRACEROUTE may be differ, depend on your VM OS. What is your OS for VM 100 an 101? Do you have firewall enable on both VM?

You don't have to check each return value, but the status needed to make sure the FINAL result. For example: you need to check if the VM stopped successfully after STOP command, otherwise CREATE command will be fail (because VM ID already exist).

The GUI should work fine. Maybe you click on wrong UI? There are 3 Firewall enable location ( +1 on Network dvice ). This option is on VM section, not on Datacenter or Nodes.

According to: http://pve.proxmox.com/wiki/Multicast_notes#Linux:_Enabling_Multicast_querier_on_bridges So, multicast will work even Router/Switch don't support, right?

You must enable Firewall on VM 101. Mine like this: # cat /etc/pve/firewall/1000001.fw [OPTIONS] enable: 1 [RULES] IN DROP -p tcp -dport 80 Also, for Qemu/KVM VM you must enable "Firewall" on Network Device (Click VM 101 -- Hardware - Network Device).

Since you use PHP then just: $svr_hostname = 'prox-1001'; $pve2->post("/nodes/$svr_hostname/openvz/101/status/stop", array());

You must understand that Proxmox has 3 levels firewall: Datacenter, Node and VM. CAUTION!!! In Datacenter -- Firewall: you must set INPUT and OUTPUT Policy = ACCEPT, otherwise you will be blocked yourself!!! Since you need to Blocking port 80 on VM 101, then you must: 1. Enable Firewall on VM...

I have added: # echo 1 > /sys/devices/virtual/net/vmbr0/bridge/multicast_querier on both Nodes, # /etc/init.d/networking restart But omping still not success for multicast. I'm using Linux Bridge (not OVS Bridge). root@ns501942:~# omping uds-001 uds-028 uds-028 : waiting for response msg...

Just leave blank for both SOURCE and DESTINATION, apply Firewall to Datacenter section.

When you restore then old IP restored. I see you use 192.168.4.1 and 192.168.6.1 both 255.255.255.0. Check again VM IP.

Does it work if firewall disable? Does it work when using noVNC? Do you use Proxmox VNC or another VNC Server?

Just add secondary IP to eth0:0. Proxmox based on Debian, so the procedure is same.