Squid Proxy Issues

I have a serious issue with squid. I deployed a server for a small forex brokerage firm. they have a trading platform that trading is only allowed on. i discovered that the moment i deploy the squid settings as transparent proxy with ssl and block http and https ports, the mt4 servers are all blocked off. If i even add the allowed domain on sites without proxy and domains without proxy yet no connection. if i remove the blocked http and https and then switch to transparent, it works. what do i do to solve this

Could you please post the squid.conf file


and the result of

ipset list

@davidep I think I have a similar problem with a non transparent proxy. I added a site to “Domains without proxy” but if I do a

ipset list

it isn’t shown.


# ================= DO NOT MODIFY THIS FILE =================
# Manual changes will be lost when this file is regenerated.
# Please read the developer's guide, which is available
# at NethServer official site: https://www.nethserver.org

# Uncomment this to enable debug
#debug_options ALL,1 33,2 28,9

# Sites not cached
acl no_cache dstdomain "/etc/squid/acls/no_cache.acl"
no_cache deny no_cache

# Allow access from green and trusted networks.
acl localnet src
acl localnet_dst src
# Allow access from blue: enp1s0
acl blue src

# Safe ports
acl SSL_ports port 443
acl SSL_ports port 980		# httpd-admin (server-manager)
acl SSL_ports port 9090		# Cockpit Web UI
acl Safe_ports port 80		# http
acl Safe_ports port 21		# ftp
acl Safe_ports port 443		# https
acl Safe_ports port 70		# gopher
acl Safe_ports port 210		# wais
acl Safe_ports port 1025-65535	# unregistered ports
acl Safe_ports port 280		# http-mgmt
acl Safe_ports port 488		# gss-http
acl Safe_ports port 591		# filemaker
acl Safe_ports port 777		# multiling http
acl Safe_ports port 980		# httpd-admin (server-manager)

# 20acl_00_portscustom

# exclude localhost from logging
# these lines have to go before any logging acl
access_log none to_localhost
# 20acl_95_localnet_log
# Make sure logs go to access.log
# Put custom logging config above this section
access_log daemon:/var/log/squid/access.log squid localnet
access_log daemon:/var/log/squid/access.log squid blue

# Allow access from localhost
http_access allow localhost

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# Only allow cachemgr access from localhost
http_access allow localhost manager
http_access deny manager

# Skip URL rewriter for local addresses
acl self dst
acl self dst
acl self_port port 80
acl self_port port 443
url_rewrite_access deny self localnet  blue  self_port

# Block access to green from other networks
http_access deny self blue localnet_dst

# No authentication on green and trusted networks
http_access allow localnet
# No authentication on blue
http_access allow blue

# And finally deny all other access to this proxy
http_access deny all

cache_mem 256 MB

# Leave coredumps in the first cache dir
coredump_dir /var/spool/squid

# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:		1440	20%	10080
refresh_pattern ^gopher:	1440	0%	1440
refresh_pattern -i (/cgi-bin/|\?) 0	0%	0
refresh_pattern .		0	20%	4320
refresh_pattern ([^.]+.|)(download|(windows|)update|).(microsoft.|)com/.*\.(cab|exe|msi|msp) 4320 100% 43200 reload-into-ims

# Always enable manual proxy
http_port 3128

# Enable transparent proxy
http_port 3129 transparent

acl https_proto proto https
always_direct allow https_proto
ssl_bump none localhost
sslproxy_options NO_SSLv2,NO_SSLv3,No_Compression
sslproxy_cipher ALL:!SSLv2:!ADH:!DSS:!MD5:!EXP:!DES:!PSK:!SRP:!RC4:!IDEA:!SEED:!aNULL:!eNULL
# TLS/SSL bumping definitions
acl tls_s1_connect at_step SslBump1
acl tls_s2_client_hello at_step SslBump2
acl tls_s3_server_hello at_step SslBump3
# TLS/SSL bumping steps
ssl_bump peek tls_s1_connect all
ssl_bump splice all
# peek at TLS/SSL connect data
# splice: no active bumping

# 45marks

# Enable squidGuard 
url_rewrite_program /usr/sbin/ufdbgclient -l /var/log/squid
url_rewrite_children 20 startup=5 idle=5 concurrency=0
url_rewrite_extras "%>a/%>A %un %>rm bump_mode=%ssl::bump_mode sni=\"%ssl::>sni\" referer=\"%{Referer}>h\""

# 90options
forward_max_tries 25
shutdown_lifetime 1 seconds
buffered_logs on
max_filedesc 16384
logfile_rotate 0

@alefattorini @mrmarkuz @stephdl please can you help with this.

You could try to set the domains, which are allowed, manually at the config.
Make a custom template


with the following content

acl allowed_hosts dstdomain AllowedDomain

AllowedDomain is the domain you want to reach if everything else is blocked.

1 Like

how di create the custom template


In a root console of your Nethserver (connect with SSH or at a local console) do the following:

Create the necessary folders:

mkdir /etc/e-smith/templates-custom/etc
mkdir /etc/e-smith/templates-custom/etc/squid
mkdir /etc/e-smith/templates-custom/etc/squid/squid.conf

Create the template:
(If nano is not installed, install it with yum install -y nano)
nano /etc/e-smith/templates-custom/etc/squid/squid.conf/20acl_10_ipcustom

Add the content to your new template (Copy and paste):
acl allowed_hosts dstdomain AllowedDomain

CTRL + X to end, confirm with y and save.

Expand the squid config:
expand-template /etc/squid/squid.conf

Restart Squid with command or via Web-GUI

Hope that helps


1 Like

Here is also a link to the docs.


If you have more questions don’t be shy to ask.