Cannot see Router IP address via Winbox

Hi I have made trunk port on both my MK router and CISCO switch. All vlan are passing through no problem.
But somehow when my CISCO is in trunk port mode i cannot see IP address of my router in winbox.
But if on CISCO i switch back to access port i can see the IP address.
What can be the issue.???
winbox screenshot.png

It depends on whether CRSes have IP address on that VLAN which is used to transport traffic between them and WinBox. Your management PC (running WinBox) is probably connected to access port of certain VLAN on the Cisco. When you enable trunk operations (tagged only), this same traffic is then sent over to CRS tagged. And CRS then needs IP address in that VLAN to communicate on L3. WinBox doesn’t need it … it can talk to CRS via L2 (using MAC address). If you’re enabling management VLAN (and CRSes have IP addresses in that VLAN) while management PC is member of any other VLAN, then WinBox device discovery won’t work because discovery is done using broadcast packets … which are not routed between different IP subnets. So you’ll have to “blindly” connect to CRS’ IP address.

BTW, ROS versions on your CRSes are ancient. I strongly suggest you to upgrade devices to latest LTS (which is 6.49.13 at the moment).