Hi there, For some time (since I updated to 2.7) I can not reach my sites that are behind a firewall. Both, client and server use Linux (SuSe 9.1 and 8.2) Here a typical session: robert@salome:~> ftp salome.redcor.net 8121 Connected to zope3.aemmenet.ch. 220 zope3 FTP server (Medusa Async V1.23 [experimental]) ready. Name (salome.redcor.net:robert): 331 Password required. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> passive Passive mode: off; fallback to active mode: off. ftp> passive on Passive mode: on; fallback to active mode: off. ftp> ls 500 'EPSV': command not understood. 227 Entering Passive Mode (193,246,254,160,67,11) And then nothing happens anymore.. From the FTP documentation I learned that passive FTP negotiates a second control board which is in the case of the given example 67 * 256 +11 = 17163. This port is blocked by the firewall. I do not know who is setting this port (client or server) and how to control the range from which is selected. Any help is appreciated Robert