[squid-users] "NF getsockopt(SO_ORIGINAL_DST)" filling cache.log due to AWS ELB healthchecks

[John Smith]

hi,

I have a working(?) squid 3.10 proxy configuration.
squid-3.1.10-29.18.amzn1.x86_64 on AWS Linux behind an AWS elastic load
balancer.

My problem is that it appears every single AWS elastic load balancer
healthcheck triggers a line like this in cache.log:
2015/10/28 22:35:10| IpIntercept.cc(137) NetfilterInterception:  NF
getsockopt(SO_ORIGINAL_DST) failed on FD 14: (92) Protocol not available

I have determined that if I removed the 'intercept' option from our
http_port 3128, we no longer get the warning messages in cache.log, but
squid also no longer functions as we want it to...

How do we resolve this?'
Thanks!

My squid.conf:

#
# Recommended minimum configuration:
#
acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged)
machines

acl httpacl port 80
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

#
# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager

# 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

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#

negative_ttl 3600 seconds

# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed
http_access allow localnet
http_access allow localhost

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

# Squid normally listens to port 3128

http_port 3128 intercept

# We recommend you to use at least the following line.
hierarchy_stoplist cgi-bin ?

# Uncomment and adjust the following to add a disk cache directory.
cache_dir ufs /squid1 30720 16 256
cache_dir ufs /squid2 30720 16 256
cache_mem 10 GB
access_log /logs/squid/access.log
cache_log /logs/squid/cache.log

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

visible_hostname l1

# Add any of your own refresh_pattern entries above these.
refresh_pattern -i \.(html|htm|css|js)$ 1440 40% 259200
refresh_pattern -i \.(gif|png|jpg|jpeg|ico|otf|woff|eot|ttf|svg)$ 10080 90%
259200 override-expire ignore-no-cache ignore-no-store ignore-private
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

cache_peer l2proxy  parent 80 0 no-query no-digest name=http_peer
cache_peer_access http_peer allow httpacl
cache_peer l2proxy parent 3129 0 no-query no-digest name=https_peer
cache_peer_access https_peer deny httpacl
never_direct allow all
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