.net - TLS handshake with a smartcard fails randomly -

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i have windows service periodically connects host using .net socket class. it's standard tcp/ip connection using smtp protocol.

the connection secured certificate stored on smartcard. i'm using sslstream class handle ssl stuff.

this works of time. @ random point of time, authentication fails. error:

a call sspi failed, see inner exception. error type: system.security.authentication.authenticationexception server stack trace:  @ system.net.security.sslstate.endprocessauthentication(iasyncresult result) @ system.threading.tasks.taskfactory`1.fromasynccorelogic(iasyncresult iar, func`2 endfunction, action`1 endaction, task`1 promise, boolean requiressynchronization)

inner exception:

system.componentmodel.win32exception local security authority cannot contacted

after failed attempt, authenticationexcpetion remains, inner exception changes:

a signature operation must performed before user can authenticate

at point have restart service , connect flawlessly. ssl handshakes work time (sometimes several days) before error occurs again.


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