I cannot add a second WAN port on my Sophos Firewall

Question

Hi All 
 I am trying to add a second WAN port in Sophos Firewall (XGS126 (SFOS 19.0.0 GA-Build317) but when I add the IP address, net-mask, gateway ip then I press Save and then Update interface - I get this error: "ip address lies within the leased ip range configured in the dhcp server" But it does not so I am lost here, what I am doing wrong? 
 I even tried to edit my existing WAN port and I got the same error 
 
 Please help me 
 
 thanks in advance 
 
 Best regards 
 Charbel

Charbel Charro · Accepted Answer

Thanks Guys for the Quick help, I have one DHCP server and the WAN ip was clearly not in the same range, so after 2 hours of looking I decided to reboot the Sophos Firewall and when it rebooted it worked directly and now it is fully working. Not sure what the issue was. 
 Thanks again 
 
 Best regards 
 Charbel

I cannot add a second WAN port on my Sophos Firewall

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