"connection.gateway-ping-timeout: cannot set property: value of "###" of type 'guint' is invalid or out of range for property type 'gateway-ping-timeout' of type 'guint' "

"###" is sometimes a different value and sometimes repeating.

Also reported here

Found a bug report here

This is new to 16.04. If a fix is not available, a workaround would help too.


I had this very same issue with connection.gateway-ping-timeout. Forcing a value different from default 0 from a shell worked for me:

nmcli c modify "Wired connection 1" connection.gateway-ping-timeout 10

I was then able to configure a manual IP address from the KDE Connection Editor.

| improve this answer | |
  • It looks like it does allow for a single edit to be completed through the connection editor, at least after a few tries which is enough of a workaround. – K. Eoe May 3 '16 at 1:30
  • Could add what to do if the desired network does not show up in the connection editor and thus nmcli does not find the network name? For wireless connections ofc – idkfa May 4 '16 at 11:00

John`s tip helped me.

I had a similar problem. I was able to create a VPN-connection through import *.ovpn file. But after the connection was add, I was not able to edit it in the Network Manager. I have completed:

nmcli connection modify "<VPN-connection name>" connection.gateway-ping-timeout 100

Then I open the properties of VPN-connection and disable ipv6 support. After that I was able to make any changes in this connection and it worked.

| improve this answer | |
  • Is there a way to set that as a default for all network connection types? I am getting that error message on creation of the vlan and it never finishes the creation of the connection for me to do that – Kendrick Dec 30 '16 at 19:21

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