FTP upload not possible

HI all,

I have asked this before, but have not received any answers, that helped me:

When using squid as proxy and cache server, it is not possible to use the upload facility in netscape. The "Upload file" facility I located:
Netscape --> File --> Upload File(Item no. 8)
At the client side I have tried:
Netscape 3.01
Netscape 4.07
Netscape 4.5

Can anyone help me? I don't need to hear if you don't have the same problem, that is not helpful.

The "upload file" works when I use a netscape proxy server.

Best regards
Thomas

This is my squid.conf:
acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY
maximum_object_size 400096 KB
cache_dir /ext01/squid/cache 3000 16 256
cache_access_log /usr/local/squid/logs/access.log
cache_log /usr/local/squid/logs/cache.log
cache_store_log /usr/local/squid/logs/store.log
pid_filename /usr/local/squid/logs/squid.pid
emulate_httpd_log on
mime_table /usr/local/squid/etc/mime.conf
cache_dns_program /usr/local/squid/bin/dnsserver
dns_children 5
authenticate_program /usr/local/squid/bin/ncsa_auth /usr/local/squid/etc/passwd
authenticate_children 5
authenticate_ttl 3600
acl passwdauth proxy_auth "/usr/local/squid/etc/proxyusers"
acl inner dst 10.100.3.10/255.255.255.255
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl SSL_ports port 443 563
acl Safe_ports port 80 21 443 563 70 1025-65535
acl CONNECT method CONNECT
acl Destination_Denied dst "/usr/local/squid/etc/Destination_Denied"
acl sex url_regex "/usr/local/squid/etc/sex"
acl notsex url_regex "/usr/local/squid/etc/notsex"
http_access deny Destination_Denied
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access deny sex
http_access allow localhost
http_access allow inner
http_access allow all passwdauth
http_access allow notsex passwdauth
icp_access allow all
miss_access allow all
proxy_auth_realm Squid proxy-caching
cache_mgr webadmin
cache_effective_user webadmin
cache_effective_group admweb
logfile_rotate 10
icon_directory /usr/local/squid/etc/icons