FAQ JonDo FAQ JonDoFox FAQ Payment
  1. Functionality and Concept

    1. What is the relationship between AN.ON, JonDonym, JAP, JonDo, JonDos and a JonDonaut?
    2. I use JonDo. Who can observe my surfing?
    3. Does JonDo encrypt data traffic? If not, I would not surf anonymously at all!
    4. Is all data sent from my computer encrypted?
    5. Are all data between me and the web server / the web site encrypted?
    6. Do you save log files?
    7. Is there a way to trace criminal activity of a JonDonym connection?
    8. Could JonDonym not be used by the government for control?
    9. I cannot or do not want to register at your web site. May I nevertheless use JonDonym?
    10. I use JonDo, so do I still need other forms of protection for my computer and data?
  2. Installation and Removal

    1. Help! Nothing works (any more)! I can neither connect to any service nor (re)load services.
    2. Does JonDo change my system settings in any way?
    3. How may I validate the signature of the downloaded JonDo file?
    4. Why am I not able to surf the Internet anymore after removing JonDo?
    5. I have a Linux with two Java versions installed. How may I switch between them?
    6. How can I minimize JonDo into the Windows systray?
    7. Is the Internet Explorer suitable for surfing anonymously?
  3. Security and Problems in Operation

    1. Why am I not able to connect to the Internet while using JonDo and Kaspersky Internet Security?
    2. It takes much time to start JonDo. I am using Sophos Anti-Virus.
    3. Although I use premium services, the page reproduction is extremely slow or does not work at all!
    4. Google says I have a virus or spyware on my computer. What shall I do?
    5. I need an US IP-Address. Is this possible using JonDonym?
    6. I've done a test of my firewall on www... But using JonDo some ports are open. Why?
    7. My JonDoPortable does not start my JonDoFoxPortable automatically anymore. What can I do?

Functionality and Concept

  1. What is the relationship between AN.ON, JonDonym, JAP, JonDo, JonDos and a JonDonaut?

    JonDonym is a development branch of the AN.ON project. And JAP is the predecessor of JonDo, the client software which connects users to the JonDonym/AN.ON mix network. JonDos is the company which is actively developing JonDo and is the billing instance between the users and the mix operators. JonDonauts are the ones surfing anonymously via the JonDonym network.

  2. I use JonDo. Who can observe my surfing?

    Your provider can only see that you are using the anonymization service JonDonym. An encrypted channel is set up between JonDo and the anonymization servers, over which your data is sent. All data requests in the browser that leave or arrive at your computer are therefore encrypted. However, if you installed the provider's access software on your computer, he could bypass JonDo easily. You should not do this accordingly. You do not need this software to access the internet using your provider (even if he should tell you that...).

    Your boss, colleagues, or system administrator at work? The only thing apparent at work is that you are using JonDonym services, but not what you are using them for. Of course, when surfing at work, one should be aware that the old "reading-over-your-shoulder" type of observation, or by direct access to your computer, is just as easy with or without JonDo.

    A Mix Operator can only determine a relationship between the incoming and outgoing connections to his mix server and must, in fact, do this to ensure that the data packets were correctly transferred. If the user uses a mix cascade consisting of more than one independently run mix, the mix oerator of one single mix in the chain cannot determine a relationship between the user and the websites visited. For this reason, we especially point out that the "Dresden" mix cascade is for test purposes and is run solely by members of the TU Dresden. Whoever uses this cascade is protected from external observation, but the TU Dresden could theoretically observe everything.

  3. Does JonDo encrypt data traffic? If not, I would not surf anonymously at all!

    That is true. Anonymity in the Internet does not exist without strong encryption. Therefore, the data traffic is encrypted several times, namely from JonDo to every single server within a cascade. That is the reason why neither your provider nor eavesdroppers in the WLAN are able to find out which web sites you are visiting.

    Additionally, the encrypted data traffic contains a special padding which prevents an observer to guess the visited web sites out of patterns in your data traffic. This is a difference to VPN-Systems where such an attack is quite possible.

  4. Is all data sent from my computer encrypted?

    No, only the data you send over your applications that are configured for JonDo, for example your web browser, are encrypted.

  5. Are all data between me and the web server / the web site encrypted?

    Typically no, as, for achieving such an end-to-end encryption, the requested web server would have to support encryption (HTTPS/SSL) as well. Unfortunately, most of the web sites do not support this. An encrypted channel is set up between JonDo and the server of the JonDonym service only. An observer between the last JonDonym Mix and the web site may typically read the transmitted data in plain text.

  6. Do you save log files?

    JonDonym mixes usually do not collect user data. Ony a respective legal obligation may force some Mix operators to retain certain connection data. See: Law enforcement

  7. Is there a way to trace criminal activity of a JonDonym connection?

    Yes. However, law enforcement requires legal surveillance court orders against each operator in a mix cascade.

  8. Could JonDonym not be used by the government for control?

    In principle, any service could be used by the government for control and surveillance. For this reason, transparency, clarity, and trust of the service's function are vital to the user. Since there is no central instance involved in the mix concept, all mixes involved in a cascade would need to work together in order to track a connection. Because of this, any kind of observation of the Internet user, including from the side of the government, is not made easier, rather more difficult by using JonDonym.

  9. I cannot or do not want to register at your web site. May I nevertheless use JonDonym?

    Yes. The web site has nothing to do with the service, except that you find the programs to download and links to a forum and a help there. Without registration, both downloads and the online help are usable without any reservation. In order to set up an account in our forum you only need a disposable e-mail address.

  10. I use JonDo, so do I still need other forms of protection for my computer and data?

    Yes! For optimal anonymity, all JonDonauts should show the same behavior. By analyzing and comparing the data transferred by the browser header, for example the browser type or the operating system, users may be partitioned into groups, which diminishes anonymity. JonDo has its own filter and equalizes such information for all JonDonauts. A 100% effective filtering is only possible within the browser itself. For this purpose, we have created the JonDoFox.

2. Installation and Removal

  1. Help! Nothing works (any more)! I can neither connect to any service nor (re)load services.

    Almost always, this problem is caused by a personal firewall running on your computer (Kaspersky, ZoneAlarm,...) which blocks connections of JonDo. Please release JonDo in the firewall options or shut down the firewall. If you are forced to use a proxy, please check in the network settings of JonDo whether you have entered the right address and, if applicable, the correct login name for the proxy. If the settings are correct, maybe your proxy operator blocks the connection to JonDonym. Moreover, it is possible that your provider or network administrator blocks the connection to JonDo. Have a look at our online help how to circumvent blocking of JonDonym. You might also use an outdated JonDo version. In this case, please update to the current version.

  2. Does JonDo change my system settings in any way?

    No, JonDo does not change anything on your system. However, as long as you do not use JonDoFox additionally, you have to adjust your browser in order to get JonDo working properly. Please consult the JonDo help about that and inform yourself about other applications usable with JonDo.

  3. How may I validate the signature of the downloaded JonDo file?

    Please have a look at our online help.

  4. Why am I not able to surf the Internet anymore after removing JonDo?

    You have to reverse the settings in your browser if you have set it up manually. With regard to some web browsers, e.g. the Internet Explorer or Safari, these settings have an system-wide impact. That means that perhaps other applications as well start to work again only then, when you have set back these settings.

  5. I have a Linux with two Java versions installed. How may I switch between them?

    If you have several Java versions installed on your Linux system, you can switch between them by typing: sudo update-alternatives --config java

  6. How can I minimize JonDo into the Windows systray?

    Please check first in "Config->User interface" whether you have properly configured JonDo. In order to be able to minimize JonDo into the systray, the file japdll.dll has to be in the directory where JonDo is executed. Under normal circumstances, the Windows installer puts this file in the same directory as the JAP.jar and adjusts the Windows shortcuts respectively, too. If this should not be the case you have to copy this file by yourself into the JonDo directory, first. Afterwards, click with the right button of your mouse on a shortcut to JonDo (if it does not exist, create it) and edit this shortcut as follows: Destination: <path to JonDo>\jap.exe
    Execute in: <path to JAP.jar>

    Replace at the same time <path to JonDo> with the path to JAP.jar and japdll.dll, on a Windows system this is typically: C:\Program Files\JonDo

  7. Is the Internet Explorer suitable for surfing anonymously?

    Due to its close ties to the operating system and numerous dangerous plugins and functions the Internet Explorer is generally not suitable for surfing anonymously. No anonymization service is able on technical grounds to overcome these shortcomings fully. The user who wants to surf the Internet anonymously should use JonDo in combination with a Browser, like Firefox or Opera, which does not depend on a particular operation system. However, in order to achieve as much anonymity as possible we recommend to use our optimized Firefox-profile JonDoFox.

3. Security and Problems in Operation

  1. Why am I not able to connect to the Internet while using JonDo and Kaspersky Internet Security?

    Kaspersky Internet Security has a so-called "Realtime-Mode" which blocks the Internet connection of JonDo. Please deactivate this mode.

  2. It takes much time to start JonDo. I am using Sophos Anti-Virus.

    Please disable the "On Access Scanner" for JAP.jar.

  3. Although I use premium services, the page reproduction is extremely slow or does not work at all!

    Please check first whether the service you have chosen works correctly. You may do this by watching the performance data shown in JonDo. For premium services, response times of 1000ms and below and speeds of 750 kbit/s and above are normal.

    If the performance data of the service you have chosen is OK, then maybe a personal firewall or virus scanner, that is locally installed at your computer, impedes the JonDo connection.

    For testing, deactivate both of these programs, and restart JonDo. If afterwards, the connections works correctly, please consult the manual and the support of your antivirus/firewall produces in order to fix the problem.

    Some users report such problems in the context of the Internet Explorer. Partially, the connection does only work correctly after about 20 Minutes. The solution for that is easy: do not use the - slow and insecure - Internet Explorer, but JonDoFox.

  4. Google says I have a virus or spyware on my computer. What shall I do?

    You can safely ignore this message. Because there are up to several hundred people using JonDonym, now and then are some which are using automated search programs in combination with Google. But Google does not tolerate this at all and is blocking JonDonym shortly. This problem is more common with free cascades than the paid ones, and also other anonymization services like Tor are affected.

    Unfortunately it can take a while until Google's search is usable again. Sometimes it helps to change the JonDonym-service in JonDo. Alternatively, there is the opportunity to use an other search-service, e.g. Ixquick or Startpage.

  5. I need an US IP-Address. Is this possible using JonDonym?

    Yes, but only if the last mix of a cascade is in the US. An overview about running mix cascades you may have a look at the server status page.

  6. I've done a test of my firewall on www... But using JonDo some ports are open. Why?

    Such tests in the Internet do not check your own computer, but the last server of the anonymization service, respectively, because you are using its IP-Address surfing the Web. That means, as long as you are surfing anonymously such tests are useless.

  7. My JonDoPortable does not start my JonDoFoxPortable automatically anymore. What can I do?

    Make sure you have the latest JonDoPortable installed. With the JonDoFox profile 2.6.2 we changed the name of the executable file and the directory containing JonDoFoxPortable. In order to get recognized the JonDoPortable.exe had to get renewed as well.