VPN/RDP works everywhere but new site

no problems connecting VPN and then Remote desktop to my office PC; works from hotspots, hotel, from home; but not from a particular client location. I can VPN fine, but cannot run remote desktop – just get the ubiquitous “can’t connect” message. I assume that it has something to do with the firewall here but I would think that would prevent the VPN not the remote desktop… any help?

Thanks much folks.