In order to update, ETS builds up a connection either with a specific KNX server directly or indirectly via a proxy. A specific ETS proxy does however not exist, it uses a proxy of the operating system instead. A proxy with user login is supported if its user is identical to the PC user. In this case, the login for the proxy is passed on to the operating system, given there is internet access.
To setup a proxy connection on Windows 10 see here.
ETS Updates
URL: https://update.knx.org
Port: 443
ETS App Updates
URL: http://api.knx.org; https://api.knx.org
Port: 80, 443
ETS Administrative Data Updates
URL: http://update.knx.org
Port: 80
ETS Online Catalog Updates
URL: http://onlinecatalog.knx.org
Port: 80
ETS Product Information & News
URL: http://feeds.knx.org/**/product/knx_prods_intl
http://feeds.knx.org/**/news/knx_news_intl
Port: 80
**: according to the ETS language, replace ** by the language code (en, de, es, it, ...)