Verify that the ClientProtocols key exists under HKLM\Software\Microsoft\Rpc, and that it contains the correct default protocols. Refer to the following table.

Protocol Name

Type

Data Value

ncacn_http

REG_SZ

rpcrt4.dll

ncacn_ip_tcp

REG_SZ

rpcrt4.dll

ncacn_np

REG_SZ

rpcrt4.dll

ncacn_ip_udp

REG_SZ

rpcrt4.dll

If the ClientProtocols key or any of the 4 default values is missing, import the key from a known good server.

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