Cisco AP HTTPS doesnt work but SSH/ping do.

Hello

I have problem with my Cisco Aironet 1815i AP. I cant access the https GUI, only SSH/ping works. The AP is located in subnet A, and I am on subnet B. If I am on subnet A I can reach the web interface. From subnet B I can ping the AP and SSH to it but not access via HTTPS. I've checked my firewall settings and HTTPS/PING/SSH are allowed from Subnet B to A.

I assume I've missed some configuration somewhere to let me allow access the webgui from another subnet. Any ideas would be appreciated