I have SG210 firewall . I need to configure a new static public IP on interface but when I configure it it give me message "IPv6 default gateway is not set" but there is no IPv6 box to unchecked it . what can I do ?

Hi Yousef,

Could you use a completely different available interface to set your new static public IP on? Let me know if that works.

If not, please let me know and there is another workaround we can try. 

There is currently a known issue assigned as NUTM-9049 with the same behavior.

Thanks,
Karlos

This worked for me...

Enable IPv6

Go back to the interface and make your changes.  It should not produce the error this time.

Disable IPv6.