TFD-CONNECT (501 errors)

[Randal Cowen <randalcowen@xxxxxxxxx>]

For years I've been successfully running a squid. Last Wednesday the 17th magically only HTTPS requests fail over only AT&T's cellular network....

Everything still works great on any other land-line provider I've tested including AT&T's DSL service. Typically my logs show

1435691713.787 240084 <Source IP> TCP_TUNNEL/200 381 CONNECT www.google.com:443 - HIER_DIRECT/216.239.32.20 -

but now magically over the AT&T cell network they come in..

1435692019.503      0 <Source IP> TAG_NONE/501 4175 TFD-CONNECT https://iecvlist.microsoft.com/ - HIER_NONE/- text/html

Notice the odd "TFD-CONNECT" which I assume is 501 "Not Implemented" along with the URL now containing the https:// prefix...

I'm not finding much on the TFD-CONNECT, what I am finding is leading me to believe AT&T has possibly enabled their "Toll Free Data" in my area and is messing with my headers/proxy tunnel.

Has anyone else been experiencing this? Or have any helpful clues?

I have even downloaded and recompiled a completely new box for testing with the same behavior. The new box is

Squid Cache: Version 3.5.5-20150624-r13848
Service Name: squid
configure options:  '--prefix=/usr' '--includedir=/usr/include' '--datadir=/usr/share' '--bindir=/usr/sbin' '--libexecdir=/usr/lib64/squid--localstatedir=/var' '--sysconfdir=/etc/squid' --enable-ltdl-convenience

Thanks,

Randal

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