Welcome to KGS
Downloading and Installing CGoban, the KGS Client
CGoban Main Window
Introduction to KGS
KGS Plus
KGS on Androidâ„¢
Terms of Service
Admin Announcements
Newbie FAQ
Main KGS Window
Set Preferences
Server Stats
"New Game" Window
Game Window
Playing Games
Game Types
Supported Rule Sets
Supported Time Systems
Tagged Games
Rating System
Rating System Math
Main FAQ

Information for Help Editors
Resources for Help Editors
Help Discussion
Recent Changes
Translations Available (click a flag to view):
German (Germany) English (United States) Spanish (Spain) Japanese (Japan) Russian (Russia) Turkish (Turkey)

Trouble Shooting FAQ

Here are some of the more common problems.

I register, but I don't get my password in the mail.

Sometimes the KGS login mail is marked as spam.

When an account is registered and the password isn't used within 24 hours, the server will assume that it was lost and will erase the account. That means that if you didn't get the password the first time, you can fix the problem, wait until a day after you registered, then try again.

I'm having trouble cutting and pasting text from KGS.

For security reasons, applets are not allowed to access the system clipboard. This means copy and paste cannot be done between applets and non-applets. It is possible to configure Java to allow this, but, at this time, a description is beyond the scope of this help page.

The full version of the Cgoban client does supports all "cut, copy, and paste" operations. Downloading the full version provides other advantages.

  1. You can use the score estimator (on the options menu in the game window.).
  2. You can save games to your disk.
  3. You can edit sgf files (games) on your computer.

You can download the full version of the client here.

If you are using a mac then you will need to assign control clicks properly.

I am not getting my monthly emails.

My client stopped and I got this strange window with text saying "Please email to".

Mail it in. If you can't cut and past, mail a screenshot, but please don't send a BMP file. Those are really huge and fill up our mailbox! Sending text is best, if you can't do that, send a GIF or a PNG.

I can log in, but when I type something, it doesn't appear, and a bunch of other buttons and menus just don't work.

NVidia made a network card that has trouble with some applications (World of Warcraft had a similar problem with the same network card). If you have an nvidia network card, try this:

  1. Go to the "Start" menu, then to "Control Panel".
  2. Double click to open "Network Connections".
  3. Right click on your network adapter and go to properties (should be labeled as "NVIDIA nForce Ethernet Controller").
  4. Click on "Configure" and go to the "Advanced" tab.
  5. Select "Checksum Offload" and choose disable in the window to the right. It may be called Hardware Checksumming or a Checksum of some type.
  6. Click on Ok.

This should fix the problems.

Which port does KGS use?

TCP port 2379.

My SGF files do not upload.

Large sgf files may have long load times. This is dependent on the upstream of your connection and the processing/memory capabilities of your system.

I get a lot of error messages when I work with SGF files not generated by KGS.

SGF files that do not conform to SGF standards may cause unpredictable behavior of Cgoban3.

The screen shot on the Main KGS Window help page covers up some of the translation options.

  1. Put the KGS CGoban Window in full screen mode.
  2. Try reducing the size of the text your browser displays.
  3. If neither of the above is sufficient, use Set Preferences to change to the language that you want.

There is no sound.

  1. Verify that the "sound enabled" box is checked in the preferences window.
  2. Verify that the sound controls for warnings, games, and tells are set as you desire.
  3. Maybe you have the game type set to "teaching" by mistake. Teaching Account Teaching Game. The time-remaining-on-clock warnings do not apply to teaching games.
  4. Get out of the KGS client and verify that that the sound is enabled on your computer.
  5. On some Linux distributions, Java will not share sound resources with other software. You can get help with this issue in the "Linux" Room, under "Social."
  6. Solutions to sound issues caused by upgrading Java can be found on the Missing Stone Placement Sound page.

My connection was broken while I was playing a game. When I logged back on, my Resume button was grayed out.  What do I do?

Here are two things to try.

  1. Go to another chat room and then come back to the room you were in.
  2. Exit the client and log back in again.

My autodownloaded client does not work. What do I do?

How do I uninstall CGoban 3 from Java?

Delete the resources in your java cache. Instructions can be found in the published solution to a problem that occurred in February 2011.

You can also find instructions here:   Glue's KGS FAQ or another help page at Sensei's Library

What To Try When All Else Fails

Here are some suggestions.

  1. Exit from KGS and log back in again.
  2. Verify that you are using SUN java, the latest version.
  3. Uninstall the KGS client, CGoban.
  4. Install the CGoban again.
  5. Delete the resources in your java cache.
  6. Uninstall and re-install using CGoban 3 with no file association.
  7. Ask for help in the chat line in the English Game Room or in one of the other main rooms.
  8. Write an email to
  9. Check the Problemes Techniques section of the French help pages.


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