I've install Geoserver into Tomcat server 8.5, and since I've published new layer from PostGis data source, Geoserver show this message:
Server is currently busy. Please wait...
How can I stope it or fix it? On my server running Windows.
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You get that message if a long running REST POST/PUT request is running, or if another admin is running on the UI a long operation, such as computing the bounding box of a very large database layer.
There is no way to make it go away right now, the underlying configuration data structures are not thread safe for modification and the lock you see is preventing them from being ruined.
Future versions of GeoServer will have a thread safe configuration and shorter lived locks, if you are interested in having this sooner you should consider sponsoring this feature via a commercial support provider: http://geoserver.org/support/
(I've already implemented the thread safe part for 2.11 in my spare time, so implementing a smarter locking primitive is the only missing bit now)