Network display not working

SvenK

Hi folks,
on the server dashboard, there is this "Network" panel, right next to the "Memory usage" panel.
But this "Network" panel works only on my Enhance Control Server. On all other servers (application, mail, DNS etc.) it show an error message:

Failed to load
There has been an error while trying to fetch this data.
Refresh the page to try again.

In the firewall I opened every port between these servers, as recommended in the documentation and all the services seem to work fine - exept this Network panel.

Any idea, what could cause this problem?

Thanks in advance!

Greetings... Sven

Adam

Does the firewall permit ICMP?

SvenK

Adam You are right, that was the problem! Thanks a lot!
Maybe it should be mentioned in the documentation, that ICMP has to be opened in the firewall as well.
Btw. should I open to ICMP to the outside too, or only within my server cluster?

Greetings!