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VMware vFabric GemFire 6.x / 7.x Locator starts up, but fails after initial discovery (2040395)


  • When you start VMware vFabric GemFire, the locator connection begins, but fails after discovery.
  • Connection can fail with cache servers, but is typically observed with locators first.


This occurs when UDP is blocked (such as by Windows Firewall), which vFabric GemFire uses to communicate between peer members, such as cache servers and locators.

Since the initial connection for locator discovery is made via TCP, a firewall rule set that allows TCP, but prohibits UDP connections, allows the initial discovery while blocking the member-to-member connection.


To resolve this issue, allow the necessary UDP traffic.

To do so:
  • Remove the firewall rule that blocks UDP traffic


  • Set membership-port-range in the file to restrict the port range used for membership communication.

Additional Information

Pivotal Links:
Pivotal GemFire Knowledge Base:

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