Using upnp to map port
Oct 12, 2015 · turn off the checkbox in the GUI under Options → Network → Map port using UPNP (see above) add the line upnp=0 to your bitcoin.conf file; add -upnp=0 to the command line options; Also upgrade to a version of Bitcoin Core at least 0.10.3 or 0.11.1. These versions upgrade the library to a non-vulnerable version, as well as disable UPnP by