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we have an ASP to receive soap messages as follows:

Set doc = Server.CreateObject("MSXML2.DOMDocument")
doc.load(Request)

if Len(doc.xml) = 0 then
ErrorMessage(...)
exit sub
end if

The problem occured by moving from W2K / IIS 5 to W2K3 / IIS6: When posting a soap message larger then about 500 KB, Len(doc.xml) returns 0. So we are not able to transfer larger Soap messages. The same code works for W2K / IIS 5 even with sizes over 6MB. The doc.load() function returns rather quickly without any errror.