This topic describes the compatibility rules for deploying different versions of Pivotal GemFire.
GemFire clients can run version 8.2.3 or a more recent 8.2 version of GemFire and still connect to GemFire servers running version 9.x. Version 9.x clients, however, cannot connect to servers running older versions of GemFire.
In multi-site (WAN) deployments, one site can be running GemFire 8.2.3 or a more recent GemFire 8.2 version, and another site can be running GemFire 9.x. The sites should still be able to communicate with one another.