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FS#8823 — vac1 http auth
Scheduled Maintenance Report for Network & Infrastructure
Completed
When an IP is on the VAC:

For a few days there has been some strange
occurences when a HTTP connects to a redirect in WEB requests

$ telnet 176.31.184.175 80
Trying 176.31.184.175...
Connected to 176.31.184.175.
Escape character is '^]'.
GET / HTTP/1.0
HTTP/1.1 302 Found
Connection: close
Pragma: no-cache
cache-control: no-cache
Location: /

Connection closed by foreign host.

According to research, this is relates to
a type of protection against attacks
that is done via a web redirection:
a browser does the redirection without problem
and the SRC IP is whitelisted.
However, when an attack script ot a robot does not
know how to do the redirection, it is blacklisted.

We have not activated this on the VAC (arbor). Bug.
To fix it, we have activated then deactivated this option.
Now it is no longer active. Bug confirmed and fixed.

Update(s):

Date: 2013-06-19 06:27:59 UTC
We had the confirmation of many customers that the problem is fixed.

Date: 2013-06-19 06:26:49 UTC
we are testing a workaround.

It was implemented.

Date: 2013-06-18 08:59:20 UTC
~$ telnet 37.187.45.107 80
Trying 37.187.45.107...
Connected to 37.187.45.107.
Escape character is '^]'.
GET / HTTP/1.0
HTTP/1.1 302 Found
Connection: close
Pragma: no-cache
cache-control: no-cache
Location: /

Connection closed by foreign host.

we activate and deactivate the option

~$ telnet 37.187.45.107 80
Trying 37.187.45.107...
telnet: Unable to connect to remote host: Connection refused


~$ telnet 37.187.45.107 80
Trying 37.187.45.107...
telnet: Unable to connect to remote host: Connection refused


a few minutes later:

~$ telnet 176.31.224.187 80
Trying 176.31.224.187...
Connected to 176.31.224.187.
Escape character is '^]'.
GET / HTTP/1.0
HTTP/1.1 302 Found
Connection: close
Pragma: no-cache
cache-control: no-cache
Location: /

Connection closed by foreign host.

we activate and deactivate the option.

~$ telnet 176.31.224.187 80
Trying 176.31.224.187...
telnet: Unable to connect to remote host: Connection refused


~$ telnet 176.31.224.187 80
Trying 176.31.224.187...
telnet: Unable to connect to remote host: Connection refused

Date: 2013-06-18 08:58:20 UTC
The option automatically reactivates itself after a few minutes,
without any intervention on the box.
We are consulting the arbor tech staff.
Posted Jun 18, 2013 - 08:55 UTC