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Internet Privacy &
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4 Proxy Support Pages
Proxies are Displayed with Red Xs -
Are all proxies marked with an X in the Bad Response column?
If so, the problem may be caused by some incompatibility with other software
running on your computer, or specific parameters of the Internet connection.
Please run the Compatibility Test from the Help menu in A4Proxy and study
the results. If some of the proxies don't have an X in the Bad Response
column, it is likely that you filtered them
A4Proxy performs two functions:
- It stands between your browser and the Internet and redirects all requests
from the browser to the proxy servers in the database; as a result, the website
doesn't have your IP address, and has the address of the proxy instead.
- A4Proxy can also check proxy servers for anonymity. In order to do so, A4Proxy
makes the proxy connect to your own computer, as if it was a web server (the
proxy connects to the A4Proxy software). This enables A4Proxy to analyze the
anonymity of the proxy server very thoroughly, but on the other hand, if e.g.
you have a firewall, the check results will be invalid, because the proxy
cannot connect to your computer and A4Proxy will decide that the proxy is
not functioning. However, function #1 will still work, even with a firewall.
There may be reasons for the test failure, other than a firewall: your computer
may not have a public IP address, or your provider may be blocking incoming
What can be wrong:
- A firewall (installed on your computer), blocking inbound traffic to A4Proxy
(during checking, A4Proxy makes proxy servers connect to your computer as
if it was a web-server. If the firewall blocks inbound traffic on port selected
in the Check Port option in A4Proxy (by default, 80), checking will not work.
Some information on using A4Proxy with firewalls can be found here.
Note that during the checking, requests come to your computer from the "outside",
unlike ordinary browsing, when requests go from your computer to the destination
servers. Incoming requests are never required for ordinary surfing and therefore
they are often blocked by firewalls and sometimes by providers, and routers
have to be specifically configured to forward them into the network.
- Your provider may block inbound traffic on certain ports (a sort of firewall
operated by the provider). Try selecting a different port in the Check Port
option on the Proxy Options tab in A4Proxy. E.g., instead of 80 which is the
default, select 8080. You can also enter any other number there.
- Conflicts with other software. Not all conflicts with other software can
be detected by A4Proxy automatically in the Compatibility test. Some firewalls
may not shutdown properly and still prevent incoming messages from reaching
A4Proxy even if you reconfigured them. Some other software may also cause
difficulties, e.g. the Freedom software suit, which is incompatible with A4Proxy
but cannot be detected automatically.
Tech. Support Topics:
- Introduction: Examples of Use
- Introduction: Configuration
All proxies are Red Xs -
- Difficulties with surfing
- Understanding Advanced Options
- Using A4Proxy with programs other than your web browser or download manager
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