[SOLVED] GUI times out if trying to view other node's details

[dsch]

Hello!

I have a new 3-node Proxmox cluster. Lets call the nodes A, B, and C.
I opened the dashboard on A and started to add nodes, it was fine. Then I wanted to add some VMs to B, but the storage dropdown was empty.
Then I went to Datacenter -> B -> local (B), but the main pane is grayed, there is first a spinner (Loading...) then after some time "communication failure (0)".
Then I noticed the same on any menu entry where any details should be displayed (Node Summary, Time etc.).

If I open the Dashboard on B, its details are displayed but not the other 2 nodes'.

What I see in the logs:
syslog:
"pveproxy[xxxxx]: proxy detected vanished client connection".
pveproxy/access.log:
xxxxx - root@pam [10/Oct/2016:16:48:49 +0200] "GET /api2/json/nodes/[Noder C]/storage/local/status HTTP/1.1" 595 -
xxxxx - root@pam [10/Oct/2016:16:50:49 +0200] "GET /api2/json/nodes/[Noder C]/storage/local/status HTTP/1.1" 500 -


What am I missing?

Kernel Version
Linux 4.4.19-1-pve #1 SMP Wed Sep 14 14:33:50 CEST 2016
PVE Manager Version
pve-manager/4.3-1/e7cdc165

Did apt-get dist-upgrade a hour ago.

 

[dsch]

It turned out Proxmox tried to communicate on IPv6.
While IPv6 was enabled all traffic was dropped on the firewall. Setting up the right rules solved the issue.