Unable to import images to Software Management

Hi,

I am testing an upgrade from BIG-IP VE 12.1.1 to 12.1.2. I have loaded the BIGIP-12.1.1.1.0.196.ALL-scsi.ova file into VMware Workstation 10 and performed initial config of interfaces etc.

However, when I attempt to upload the BIGIP-12.1.2.0.0.249.iso file using the import button I get the following error when I click Import:

Bad Gateway!

The proxy server received an invalid response from an upstream server.

Error 502

I have also tried to SCP the file onto the box in the /shared/images/ folder but the ISO still wont show in the Available Images section.

I feel like I have missed something basic here.