Solved! Set the following parameters to default values again, then it worked:
ssl/ssl_lib
Windows NT:<DRIVE>:\usr\sap\<SID>\
SYS\exe\run\sapcrypto.dll
sec/libsapsecu
Windows NT:<DRIVE>:\usr\sap\<SID>\
SYS\exe\run\sapcrypto.dll
ssf/ssfapi_lib
Windows NT:<DRIVE>:\usr\sap\<SID>\
SYS\exe\run\sapcrypto.dll
ssf/name
SAPSECULIB
In our case the parameter ssf/name was written in low case (sapseculib), after changing it to SAPSECULIB and restarting application server ... problem solved :)
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