Machine Cert Auth Error - unable to get local issuer certificate

Hey Seth,

Always appreciate your help. Unfortunately the above steps did not resolve the issue. I do agree it is probably a client issue. I am just puzzled as these are my isolated machines and I know all changes I've ever made, we're made to the entire section. I was expecting to see failure in the logs, but it appear all came back successful and positive.

2015-03-25,15:49:15:795, 1308,4244,, 48,,,, current log level = 63
2015-03-25,15:49:15:795, 1308,4244,, 48, , 39, ::DllMain, ActiveX control location: "C:\Windows\Downloaded Program Files\f5certchk.dll"
2015-03-25,15:49:16:296, 1308,4244,, 48, , 73, CCertCheckCtrl::Verify, certInfo:STORE_NAME:MY&STORE_LOCATION:LocalMachine&ALLOW_ELEVATION:1&MATCH_FQDN:0, RootCertInfo:IS_TRUSTED:0, Nonce: d0RTVXplUDA3cHlzQTZPaDFxRkY=
2015-03-25,15:49:16:296, 1308,4244,, 48, , 96, CCertCheckCtrl::Verify, Store name:"MY", Store location:"LocalMachine", Subject match FQDN:"0", Allow elevation UI:"1", Serial number(HEX):"", Issuer:"", SubjectAltName:""
2015-03-25,15:49:16:297, 1308,4244,, 48, \certinfo.cpp, 1152, CCertInfo::MatchCertificate, fqdn:
2015-03-25,15:49:16:297, 1308,4244,, 48, \certinfo.cpp, 1302, CCertInfo::FindCertificateInStoreExt: , Total certs tested: 1
2015-03-25,15:49:16:297, 1308,4244,, 48, \certinfo.cpp, 1306, CCertInfo::FindCertificateInStoreExt: ,   found matched certificate.

2015-03-25,15:49:16:297, 1308,4244,, 48, \m_uac_helpers.cpp, 77, uGetProcessIntegrityLevel(), Running on high integrity level

2015-03-25,15:49:16:300, 1308,4244,, 48,,,, CCertInfo::IsPrivateKeyPresent: CryptAcquireCertificatePrivateKey succeeded: found private key.
2015-03-25,15:49:16:300, 1308,4244,, 48, , 343, CCertCheckCtrl::CheckPrivateKey, The machine certificate has private key on this machine
2015-03-25,15:49:16:302, 1308,4244,, 48,,,, CCertInfo::SignHash: CryptAcquireCertificatePrivateKey succeeded: found private key.
2015-03-25,15:49:16:305, 1308,4244,, 48, , 369, CCertCheckCtrl::CheckPrivateKey, Signing message succeeded
2015-03-25,15:49:16:305, 1308,4244,, 48, , 266, CCertCheckCtrl::Verify, Succesfully found the certificate and verified the private key