Squid Error on POST

Thu Jun 8 23:27:30 UTC 2006

When POSTing big form I just get such error

While trying to retrieve the URL: http://win.mail.ru/cgi-bin/sendmsg 

The following error was encountered: 
Read Error 

The system returned: 

    (60) Operation timed out

An error condition occurred while reading data from the network. Please
retry your request.

The part of config is:

acl xdsl src 10.80.0.0/16
acl adsl src 10.90.0.0/16
tcp_outgoing_address IP_1 xdsl
tcp_outgoing_address IP_2 adsl

http_access allow xdsl adsl

It happened when we changed primary ISP. On IP_1 everything works fine. On
IP_2 - troubles. Without proxying works fine on IP_1 and IP_2. Proxying is
transparent. Using ipfw2.
Please help.