Error unmarshaling return header

On a heavily loaded system I occasionally get these? 

Anyone seen them? What's odd is that the read timeout is set to days. Is
this something else that is timing out? An ack rather than a read?  Is
there a sun rmi timeout  property that I should be increasing? Does SSL
play a part here?
 
java.rmi.UnmarshalException: Error unmarshaling return header; nested
exception is:
        java.net.SocketTimeoutException: Read timed out
        at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:203
)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
        at
com.me.services.ElementManagerService_Stub.addVersions(Unknown Source)
        at com.me.RuleRunner$3.run(ElementSpecifierRuleRunner.java:1137)
        at
EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(Unknown
Source)
        at java.lang.Thread.run(Thread.java:534)
Caused by: java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:129)
        at com.sun.net.ssl.internal.ssl.InputRecord.a(DashoA12275)
        at com.sun.net.ssl.internal.ssl.InputRecord.read(DashoA12275)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA12275)
        at com.sun.net.ssl.internal.ssl.SSLSocketImpl.a(DashoA12275)
        at com.sun.net.ssl.internal.ssl.AppInputStream.read(DashoA12275)
        at
java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
        at
java.io.BufferedInputStream.read(BufferedInputStream.java:201)
        at java.io.DataInputStream.readByte(DataInputStream.java:331)
        at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:189
)

It also doesn't seem to matter whether or not Solaris or Windows
Server/Client are involved. 

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