>Number: 2770 >Category: mod_proxy >Synopsis: FTP proxy over firewall fails >Confidential: no >Severity: critical >Priority: medium >Responsible: apache >State: open >Class: change-request >Submitter-Id: apache >Arrival-Date: Mon Aug 3 09:50:02 PDT 1998 >Last-Modified: >Originator: [EMAIL PROTECTED] >Organization: apache >Release: 1.3.0 >Environment: Linux 2.0.34 >Description: I'm running Apache as proxy on a firewall blocking connections between unknown ports. FTP transfer to eg. ftp.microsoft.com will establish a PASV connection between two unknown ports if firewalling is disabled, but fail otherwise. I commented out the PASV section in proxy_ftp.c (line 770 "try to setup PASV first" to line 846 "try the regular way") with some success (ftp.netscape.com would work, the data connection was proxy:unknown to ftp.nescape.com:21 as expected). With ftp.microsoft.com, a connection between proxy:21 and ftp.microsoft.com:21 was established, but the browser will simply time out. No error_log entry. >How-To-Repeat: access (any) ftp-server when only connections from/to well-known ports (20, 21) are allowed. >Fix: Configuration option: use well-known ports only; try regular mode first, then PASV >Audit-Trail: >Unformatted: [In order for any reply to be added to the PR database, ] [you need to include <[EMAIL PROTECTED]> in the Cc line ] [and leave the subject line UNCHANGED. This is not done] [automatically because of the potential for mail loops. ] [If you do not include this Cc, your reply may be ig- ] [nored unless you are responding to an explicit request ] [from a developer. ] [Reply only with text; DO NOT SEND ATTACHMENTS! ]
