Ace probe failure after IIS app pool recycle?

Windows Server 2003 SP2
ACE Module A2(1.6a)
I suspect this is caused by an IIS6 setting, but posting here in case anyone has seen this.  For this one particular site, we have 4 servers in the farm.  2 of those servers are fine.  The other 2 (new) servers will generate probe failure after the site's app pool recycles.  I then remove the 2 servers from service and re-activate (no inservice, then inservice) and the probe comes back as operational.  It appears that the app pool recycle somehow is resetting the hash on the default page, though I'm not sure how.  Any ideas are very much appreciated. 

Yeah, the hash is inside the probe.  Here's the config for the serverfarm and the probe.  Public-007 and Public-008 are new servers...the other 6 have been in the farm for the last 2.5 years and they don't have this issue.  It's only the 2 new boxes that the probe fails when the app pool is recycled.
serverfarm host PUBLIC
  probe URL-DEFAULT-ASPX
  rserver PUBLIC-001
    inservice
  rserver PUBLIC-002
    inservice
  rserver PUBLIC-003
    inservice
  rserver PUBLIC-004
    inservice
  rserver PUBLIC-005
    inservice
  rserver PUBLIC-006
    inservice
  rserver PUBLIC-007
    inservice
  rserver PUBLIC-008
    inservice
probe http URL-DEFAULT-ASPX
  interval 2
  faildetect 2
  passdetect interval 2
  passdetect count 2
  request method get url /default.aspx
  expect status 200 200
  hash

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