Connection Timeout, private hub

Hello,

I've setup ADCH++ hub with TLS enabled. I created appropriate port forwarding rule to have my hub available to the internet (for certain individuals only)

I am able to connect to the hub from work using clients (ApexDC, StrongDC).
However, i am unable to "browse file list" or "get file list" no matter what i try. The client displays "connecting" and eventually "connection timed out"

I have setup the client to use a dedicated port for TCP and UDP as well a separate port for TLS, which i forwarded on the firewall. It just won't budge.
Any idea? is there some setting i've misconfigured on the hub?

Many thanks,