The following bug has been logged on the website:
Bug reference: 9087
Logged by: Craig Lucas
Email address: craigmluacs(at)gmail(dot)com
PostgreSQL version: 9.3.2
Operating system: Centos 6.4
Description:
When you create a foreign data table to a remote postgres instance and that
instance goes down or restarts, all subsequent queries on that foreign data
table fail until the foreign server is dropped and recreated.