Thanks TPTHZ, the link was very helpful. Creating a default route 0.0.0.0 with the gateway solved the issue. thanks

Model : T2600G-28TS Hardware Version : T2600G-28TS 2.0 Firmware Version : 2.0.0 Build 20170527 Rel.31275(s) ISP : Hello, can you please help me to allow remote access to t2600g from wan? The only way...