Proxy error: 502

I run Ubuntu 8.10 i386/i686, Tor, Polipo 1.0.4 (from Ubuntu repositories),
Firefox 3.0.11, Torbutton.
Firefox is configured to connect through Tor with the help of Polipo.

I get "Proxy error: 502 Disconnected operation and object not in cache"
generated by Polipo every time i start Firefox after logging in. For every
page. "Update page" button doesn't help - same error.
Workaround is to execute "sudo service polipo restart" (every time after
logging in). Then every page loads normally.
Full uninstall-reinstall (through Synaptic package manager) of Polipo
doesn't help.


cat /etc/polipo/config :
======================
# Sample configuration file for Polipo. -*-sh-*-

# You should not need to edit this configuration file; all configuration
# variables have reasonable defaults.

# This file only contains some of the configuration variables; see the
# list given by ``polipo -v'' and the manual for more.


### Basic configuration
### *******************

# Uncomment one of these if you want to allow remote clients to
# connect:

# proxyAddress = "::0"        # both IPv4 and IPv6
# proxyAddress = "0.0.0.0"    # IPv4 only

proxyAddress = "127.0.0.1"
proxyPort = 8123

# If you are enabling 'proxyAddress' above, then you want to enable the
# 'allowedClients' variable to the address of your network, e.g.
# allowedClients = 127.0.0.1, 192.168.42.0/24

allowedClients = 127.0.0.1
allowedPorts = 1-65535

# Uncomment this if you want your Polipo to identify itself by
# something else than the host name:

proxyName = "localhost"

# Uncomment this if there's only one user using this instance of Polipo:

cacheIsShared = false

# Uncomment this if you want to use a parent proxy:

# parentProxy = "squid.example.org:3128"

# Uncomment this if you want to use a parent SOCKS proxy:

socksParentProxy = "localhost:9050"
socksProxyType = socks5


### Memory
### ******

# Uncomment this if you want Polipo to use a ridiculously small amount
# of memory (a hundred C-64 worth or so):

# chunkHighMark = 819200
# objectHighMark = 128

# Uncomment this if you've got plenty of memory:

# chunkHighMark = 50331648
# objectHighMark = 16384


### On-disk data
### ************

# Uncomment this if you want to disable the on-disk cache:

diskCacheRoot = ""

# Uncomment this if you want to put the on-disk cache in a
# non-standard location:

# diskCacheRoot = "~/.polipo-cache/"

# откомментировать, чтобы включить удаление объектов
# из кэша, которые старше 10 дней (по умолчанию 32 дня),
# при команде "polipo -x" (purge on-disk cache):

# diskCacheUnlinkTime = 10

# Uncomment this if you want to disable the local web server:

localDocumentRoot = ""

# Uncomment this if you want to enable the pages under /polipo/index?
# and /polipo/servers?.  This is a serious privacy leak if your proxy
# is shared.

# disableIndexing = false
# disableServersList = false

disableLocalInterface = true
disableConfiguration = true


### Domain Name System
### ******************

# Uncomment this if you want to contact IPv4 hosts only (and make DNS
# queries somewhat faster):

# dnsQueryIPv6 = no

# Uncomment this if you want Polipo to prefer IPv4 to IPv6 for
# double-stack hosts:

# dnsQueryIPv6 = reluctantly

# Uncomment this to disable Polipo's DNS resolver and use the system's
# default resolver instead.  If you do that, Polipo will freeze during
# every DNS query:

# dnsUseGethostbyname = yes


### HTTP
### ****

# Uncomment this if you want to enable detection of proxy loops.
# This will cause your hostname (or whatever you put into proxyName
# above) to be included in every request:

disableVia = true

# Uncomment this if you want to slightly reduce the amount of
# information that you leak about yourself:

censoredHeaders = from,accept-language,x-pad,link
censorReferer = false

# Uncomment this if you're paranoid.  This will break a lot of sites,
# though:

# censoredHeaders = set-cookie, cookie, cookie2, from, accept-language
# censorReferer = true

# Uncomment this if you want to use Poor Man's Multiplexing; increase
# the sizes if you're on a fast line.  They should each amount to a few
# seconds' worth of transfer; if pmmSize is small, you'll want
# pmmFirstSize to be larger.

# Note that PMM is somewhat unreliable.

# pmmFirstSize = 16384
# pmmSize = 8192

# Uncomment this if your user-agent does something reasonable with
# Warning headers (most don't):

# relaxTransparency = maybe

# Uncomment this if you never want to revalidate instances for which
# data is available (this is not a good idea):

# relaxTransparency = yes

# Uncomment this if you have no network:

# proxyOffline = yes

# Uncomment this if you want to avoid revalidating instances with a
# Vary header (this is not a good idea):

# mindlesslyCacheVary = true


# Cut down suggestions from Incognito configuration:
tunnelAllowedPorts = 1-65535
======================



Please help to resolve this issue.
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