[enhydra] Enhydra losing track of localhost?

>From time to time one of my Enhydra 5.1.15 servers falls into weird
state:

2005-08-23 14:07:35,817: [Thread-1093], ERROR, Multiserver: Error in Enhydra 
Handler
java.net.UnknownHostException: mymachine: mymachine
        at java.net.InetAddress.getLocalHost(Unknown Source)
        at 
org.enhydra.servlet.connectionMethods.EnhydraDirector.EnhydraDirectorHandler.run(Unknown
 Source)
        at java.lang.Thread.run(Unknown Source)

It cannot find out the IP address of localhost? Restart of multiserver
fixes it for a couple days but then the problem appears again. I
hardcoded the IP address into /etc/hosts but it didn't help:

/etc/hosts:
127.0.0.1       localhost
194.108.5.10    mymachine.zln.cz        mymachine

Any idea what could cause this? OS is Debian Woody, hardware is dual P4.

Petr




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