Summary
Failure to discover / inventory VMware vSphere 5 vCenter or ESXi server from a Windows Server 2003 or Windows XP distribution server (or administration server).Symptoms
In fsend call to WinHttpSendRequest: The server returned an invalid or unrecognized response (12152)
Cause
Resolution
Change the SSL/TLS configuration for affected vCenter 5 servers to add support for RC4 ciphers. This is done by adding a <cipherList> element inside the <config> <vmacore> <ssl> section as follows into the server-dependent configuration XML file and then restarting the VMware vCenter Server service or ESXi Management Agents.
vCenter 5 servers (Windows 2003 and below): C:\Documents and Settings\All Users\Application Data\VMware\VMware VirtualCenter\vpxd.cfg
vCenter 5 servers (Windows 2008 and above): C:\ProgramData\VMware\VMware VirtualCenter\vpxd.conf
ESXi 5 servers: /etc/vmware/hostd/config.xml
<vmacore>
<ssl>
<cipherList> "HIGH:RC4-SHA:RC4-MD5" </cipherList>
</ssl>
</vmacore>
</config>
Workaround
If the above configuration changes cannot be made to vSphere 5 servers, the workaround is to perform the discovery / inventory task on a distribution server running a later operating system, for example Windows Server 2008.
Additional Information
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Case id: 00001065
Activity: Status change: 2 hours ago