Openssl Failed To Enumerate Slots

The DFS Replication service failed to contact domain controller to access configuration information. Replication is stopped. The service will try again during the next configuration polling cycle, which will occur in 60 minutes. This event can be caused by TCP/IP connectivity, firewall, Active Directory Domain Services, or DNS issues. Hello, Windows 10 power user here. I've been viewing help topics here for some time and found this forum very useful. However, there is one problem th. From the traces: OpenSSL req -engine pkcs11 -new -key 2:45 -keyform engine -out cert.pem -text -x509 -days 3640 -subj '/CN=Mike Tancsa' engine 'pkcs11' set. Failed to enumerate slots PKCS11getprivatekey returned NULL cannot load Private Key from engine 2283136:error:80002003:PKCS11 library:PKCS11enumslots:Invalid slot ID:p11slot.c:314. C (Cpp) X509getsubjectname - 30 examples found.These are the top rated real world C (Cpp) examples of X509getsubjectname extracted from open source projects. You can rate examples to help us improve the quality of examples.

Hello,
I'm using engine_pkcs11 module to initiate SSL connection authenticated by client certificate stored on the smart card. If I've got connected only 1 token (smart card itself) everything seems to be OK.
Problem occurs, after another token, without pkcs#11 support is inserted into another slot. Engine_pkcs11 responds with:
failed to enumerate slots
Key is sent to the engine including the slot id of the token.
What is the reason, that engine tries to enumerate all the slots again? Why the engine is not simply ignoring tokens, which doesn't have PKCS#11 structure and forces to cancel ssl negotiation? Why the engine is simply not connecting the slot specified within key (there is possibility to send key in format 'slot_id:key_id')?
Do you have any idea, how I can solve or workaround this problem?
Output of s_client connection initialization (if there is only 1 token, everything is working properly, after another token is inserted, error appears):

OpenSSL> engine -t dynamic -pre SO_PATH:engine_pkcs11 -pre ID:pkcs11 -pre LIST_ADD:1 -pre LOAD -pre MODULE_PATH:siecap11.dll
(dynamic) Dynamic engine loading support
[Success]: SO_PATH:engine_pkcs11
[Success]: ID:pkcs11
[Success]: LIST_ADD:1
[Success]: LOAD
[Success]: MODULE_PATH:siecap11.dll
Loaded: (pkcs11) pkcs11 engine
[ available ]
OpenSSL>
OpenSSL> s_client -engine pkcs11 -connect hostname:443 -CAfile cacerts.pem -key 3:010203 -keyform engine -cert cert.pem
engine 'pkcs11' set.
failed to enumerate slots
PKCS11_get_private_key returned NULL
unable to load client certificate private key file
2032:error:80003030:Vendor defined:PKCS11_check_token:Device error:p11_slot.c:373:
2032:error:26096080:engine routines:ENGINE_load_private_key:failed loading private key:eng_pkey.c:126: error in s_client
OpenSSL>
Thank you and best regards,
Peter.

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