Distributed session deleted on failover

Using Resin 2.1.2 EE on
1) RedHat 7.3 Sun JDK 1.4.0_01
and
2) Win2k Pro Sun JDK 1.4.0_01

Relevant section of resin.conf

          <srun id='s1' host='host1' port='6802'srun-index='1' />
          <srun id='s2' host='host2' port='6801'srun-index='2' />

Relevant section of web.xml

     <session-config>
          <session-max>4096</session-max>
          <session-timeout>120</session-timeout>
          <enable-cookies>true</enable-cookies>
          <enable-url-rewriting>true</enable-url-rewriting>
          <!-- <file-store>WEB-INF/sessions</file-store> -->
          <!-- the following entries are for distributed sessions -->
          <tcp-store />
          <always-save-session id='true' />
          <ignore-serialization-errors id='true' />
          <reuse-session-id id='false' />
     </session-config>

Apache 1.3.23 is running on host1 and caucho-status correctly indicates
up/down status of the srun servers as I flick them on and off.

I have tcp-ring sessions enabled. I see the session saved on my second
machine. The contents of the files are slightly different at the beginning
and the end.

When I shut down host1, the next request gets sent to host2, I call
request.getSession(false) and my distributed session is then invalidated
and erased.

Any ideas why?

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