Ejabberd XMPP server includes a SOCKS5 proxy, setting it up correctly is what makes the difference between fast or very slow file transfer operations. As per XEP-0065 file transfer is either peer-to-peer or mediated by a proxy server. In Conversation peer-to-peer transfer is done by converting the file in base64, split it in 4 kb chunks sent one at the time always awaiting first for the ACK of the precedent one; this makes the whole process painfully slow and bandwidth consuming. The other file transfer method supported by Conversation is defined by XEP-0234 (or Jingle file transfer) which relies on a SOCKS5 proxy and also allow to negotiate parameters like encryption. Ejabberd configuration: …