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I installed squid proxy server for windows.

I want to connect to the FTP server via proxy. Can somebody provide me the proper configuration for both squid and filezilla?

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Notes for : Squid can be used two ways for FTP clients — as a native FTP relay (preferred when available) or as an HTTP tunnel (CONNECT) that simply forwards raw TCP. Which path to use depends on the Squid build you installed on Windows; check the version with squid -v (or look in the Squid service properties). (squid-cache.org)

If your Squid supports the native FTP relay (ftp_port, added in Squid 3.5+), enable a dedicated FTP listen port and use FileZilla’s “FTP Proxy (Custom)” mode. Example squid.conf snippet:

# pick a non-privileged port to avoid conflicts
ftp_port 8021
acl localnet src 192.168.0.0/16
http_access allow localnet

Then in FileZilla: Edit → Settings → Connection → FTP → FTP Proxy → Custom. Use a login template like:

USER %u@%h
PASS %p

and set Proxy host to squid_ip:8021. That lets Squid act as an FTP server and proxy commands for you. (wiki.squid-cache.org)

If your Squid build does NOT have ftp_port, use FileZilla’s Generic Proxy (HTTP/1.1 CONNECT) or a SOCKS proxy. For HTTP CONNECT you must allow CONNECT to FTP ports on Squid — Squid blocks CONNECT to non-SSL ports by default, so add specific ACLs rather than opening everything. Example (very selective):

acl FTP_SERVERS dstdomain .example.com
acl FTP_PORTS port 21 1025-65535
http_access allow CONNECT FTP_PORTS FTP_SERVERS

Be careful: tunneling with CONNECT can break long uploads (Squid’s read_timeout defaults to 15 minutes), so either increase timeouts or prefer ftp_port. (debian.org)

Troubleshooting: confirm ftp_port presence in squid.conf or squid -v; test the proxy with telnet squid_ip 8021 to see a 220 banner; check access.log/cache.log for ERR_READ_TIMEOUT or blocked CONNECT entries; restart the Squid service after changes (Windows: Services.msc or net stop/start; Linux: systemctl restart squid). (squid-cache.org)

This gives the practical options and the minimal squid/FileZilla settings to try first.

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