I am using Squid version 4.6 on a Raspberry Pi 4 which has 7 Huawei Wifi Modems connected to it through a hub.
After successfully setting up squid to work with all 7 ports and redirect traffic to the modems, everything worked well and I could connect to it from every single port.
However, as time went on, some ports/connections just casually stop working for a few minutes or even entire hours and then get back up again.
I am almost certain that there are no problems with the modems themselves.
When I check the access log, that's what I see for the connections that did not work (the connection :
91.228.155.195 - testuser [09/Nov/2021:17:51:32 +0200] "HEAD http://pcode.info/ HTTP/1.1" 503 368 TCP_MISS:HIER_DIRECT
The HTTP error is 503, and I don't have a single clue why it happens.
Here are a couple more messages that I receive for the unsuccessful connections:
89.208.5.14 - - [09/Nov/2021:17:55:13 +0200] "CONNECT www.google.com:443 HTTP/1.1" 407 4061 TCP_DENIED:HIER_NONE
91.228.155.195 - testuser [09/Nov/2021:17:51:25 +0200] "HEAD http://pcode.info/ HTTP/1.1" 0 0 TCP_MISS_ABORTED:HIER_DIRECT
Here's my configuration for squid:
acl port1 myport 20001
acl port2 myport 20002
acl port3 myport 20003
acl port4 myport 20004
acl port5 myport 20005
acl port6 myport 20006
acl port7 myport 20007
#acl manager proto cache_object
#acl localhost src 127.0.0.1/32
#acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
#acl localnet src 192.168.0.0/24
#acl SSL_ports port 443
#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 CONNECT method CONNECT
auth_param basic program /usr/lib/squid/basic_db_auth --plaintext --persist
auth_param basic children 5
auth_param basic realm Web-Proxy
auth_param basic credentialsttl 1 hour
auth_param basic casesensitive off
external_acl_type acl_helper %MYPORT %LOGIN /usr/bin/php /home/pi/external_acl.php
acl user external acl_helper
http_access allow user
#acl user1 proxy_auth user1
#acl user2 proxy_auth user2
#http_access allow user1 port1
#http_access allow user2 port2
http_port 20001
http_port 20002
http_port 20003
http_port 20004
http_port 20005
http_port 20006
http_port 20007
dns_v4_first on
tcp_outgoing_address 192.168.9.114 port1
tcp_outgoing_address 192.168.10.116 port2
tcp_outgoing_address 192.168.11.118 port3
tcp_outgoing_address 192.168.12.120 port4
tcp_outgoing_address 192.168.13.122 port5
tcp_outgoing_address 192.168.14.124 port6
tcp_outgoing_address 192.168.15.125 port7
access_log /var/log/squid/access.log common
#coredump_dir /var/spool/squid
#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```
Sometimes restarting squid helps, sometimes it doesn't.
Does anyone know why it might happen? Any general ideas or points that could help me solve it?
Thanks in advance!
