New models of Samsung Smart TV violate RFC2396. As we can see in bug #3530232, the Request-Line contains a URI that is supposed to be an abs_path but in reality has a form of net_path. As a consequence, "//upnp/control/cds" is split into "upnp" as the authority and "/control/cds" as the abs_path. Later when MediaTomb tries to find the requested resource, it doesn't recognize "/control/cds" as something it can serve (as opposed to "/upnp/control/cds" which is a valid resource served by MediaTomb).
This patch strips excessive leading slashes if the scheme part was not found. Unfortunately this breaks the aforementioned RFC, specifically parsing URIs starting with a net_path will no longer work. I'm not sure if it actually impacts MediaTomb in any way. Are net_path URIs used in DLNA?
I will try to contact Samsung, see if they can fix their implementation.