Web farms cahing problem

It's because Kentico caches the data being displayed. By restarting the site/app pool, you're forcing the site to load fresh data vs. cached data.

Have you watched to see if the tasks are going over to the other server? Is your webfarm instance setup properly?

this is my properties, if i understand you correctly. http://prntscr.com/50aszy

have some method, to do what i want?(i edit content on first server and see it on another)

Do you have file synchronization (i.e.: Microsoft DFS) setup on your web farm servers? I've found the "auto create servers" works most of the time but have not been able to place my finger on why it doesn't work all of the time.

files are synchronized properly. Or i must synchronize iis temp files? this is very bad bug. i think than solve my problems, i think this key is a hack for such problems

Just for a future reference, cache is invalidated automatically in a web farm environment when there are any changes (e.g. content, settings, media files) made on one of the servers.

If that does not work, it could be caused by 2 possible reasons:

1. Synchronization between the web farm servers is non-functional due incorrect configuration or licensing issues.

2. Web farm tasks have not been processed yet - especially when using "Update within request" mechanism, it might take some time till that happens.

More information about how web farms work in Kentico can be found in this blog post - Kentico 8 Technology – Web farm synchronization.