RFC is a Remote Function Call and CVE is Common Vulnerabilities
and Exposures. Since RFC is commonly used for server
exploitation via viruses, most servers turn that function off, resulting in an error message like you reported.
While this may be a legitimate function call, this often means that your system has been compromised by a virus or malware. Run a reputable virus and malware scanning tool, like
this one.
You can read more about your error message
here.
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