The specified data could not be decrypted

The specified data could not be decrypted

sslStream.AuthenticateAsServer(_certificate, false, SslProtocols.Tls |
SslProtocols.Ssl3 | SslProtocols.Ssl2, true);
I get the following error message when I use the above function to
authenticate a client. This happens only after sometime for subsequent
requests. I have no clue on what it could be. I am reusing the certificate
from cache which I earlier used successfully. Looking for a possible
reason.
"A call to SSPI failed, see inner exception."
Inner Exception:"The specified data could not be decrypted"
at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken
message, AsyncProtocolRequest asyncRequest, Exception exception)
at
System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer,
Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32
readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer,
AsyncProtocolRequest asyncRequest)
at
System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer,
Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32
readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer,
AsyncProtocolRequest asyncRequest)
at
System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer,
Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32
readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer,
AsyncProtocolRequest asyncRequest)
at
System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken
message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32
count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer,
Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32
readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer,
AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean
receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult
lazyResult)
at System.Net.Security.SslStream.AuthenticateAsServer(X509Certificate
serverCertificate, Boolean clientCertificateRequired, SslProtocols
enabledSslProtocols, Boolean checkCertificateRevocation)
at HTTPProxyServer.ProxyServer.DoHttpProcessing(TcpClient client) in
C:\Users\User\Desktop\HTTPProxy-src\HTTPProxy-stable\HTTPProxy-src\ProxyServer.cs:line
232