Am 04.04.2011 um 21:46 schrieb Mats Erik Andersson: Dear Mats,
Package: proftpd-basic Version: 1.3.3a-6squeeze1 Severity: normal Tags: ipv6 upstream
That bug was filed years ago against an old version. Are you still able to reproduce the problem? Sorry for the long response time!
When using the IPv6-enabled server (and 'net.ipv6.bindv6only = 0') an IPv4-only client will get a positive/successful response to an EPRT command. However, the connection fails, because the server is establishing an IPv6 socket at ':ftp-data', not the expected IPv4 socket. The exchange goes like this: > ls 200 EPRT command successful 425 Unable to build data connection: Invalid argument After reconfiguring the server to be IPv4-only, the EPRT is fully functional, as is to be expected. The proftpd-server was freshly installed for the purpose of testing different clients, so besides the setting "UseIPv6" nothing was ever changed in the configuration. At the moment I can trigger this error using a patched FTP client from GNU Inetutils. Since this patching works correctly against the OpenBSD FTP server (with PASV, EPSV, LPSV, PORT, EPRT, LPRT), I am personally convinced that the error lies in 'poftpd/modules/mod_core.c'. Granted some time I might be able to craft a Perl client to also trigger this error.
-- http://www.hilmar-preusse.de.vu/ #206401 http://counter.li.org
