method 1 usually fixes the issue with unable to log in.
When you try to open the Exchange Management Console this error occurs:
The attempt to connect to http://sbs2011.domain.local/powershell using Kerberos authetication failed: Connecting to remote server failed with the following error message: The WS-Management service cannot process the request. The system load quota of 1000 requests per 2 seconds has been exceeded. Send future request at a slower rate or raise the system quota. The next request from this user will not be approve for at least 1522693632 milliseconds. For more information see the about Remote_Troubleshooting
just run iisreset from cmd
openssl pkcs12 -in «yourfile.pfx» -nocerts -out «keyfile-encrypted.enc»
openssl pkcs12 -in «yourfile.pfx» -clcerts -nokeys -out «certificate.crt»
openssl rsa -in «keyfile-encrypted.enc» -out «keyfile-decrypted.key»