Invalid IP address FOR a new WAN Connection

[subhendudas]

I have a Sonicwal pro 3060 that can support 2 WAN with Failover and loadbalancing. I wanted to replace the secondary WAN with a new lease line connection on the Interface X2. When I added the following IP, it gave me error 'invalid ip address' while using the same ip address scheme from a laptop, I was able to get connected through this new WAN connection. Following are the IP address scheme communicated to us by the ISP.

Customer side IP: 115.118.128.198 -assigned to X2 on the firewall
subnet mask: 255.255.255.252
Gateway (ISP side Router) 115.118.128.197
DNS1. 202.54.12.164
DNS2. 202.54.29.5

The above ip scheme is abosolutely correct and confirmed by all possible ways but my appliance just does not accept it. I am utter confusion. Can any body help me out

 

[GhislainG]

What is the IP configuration on the other interface?

 

[r_manic]

This topic has been moved from the section TomsNetworking to section General Networking by R_manic