# Troubleshoot logging on to the SMC Client

If you have trouble logging on to the SMC Client, check the connectivity, certificate, and password.

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## Steps

1. If the SMC Client reports a connection problem:
   1. Make sure you entered the address correctly on the logon screen.
      If there is a NAT device between the SMC Client and the Management Server, the IP address used must be the translated address. Locations and Contact Addresses are not used for selecting the correct address when you are just logging on.
   2. Make sure that the Management Server is running.
   3. Make sure that the network between the SMC Client and the Management Server is working and routing the traffic correctly. Make sure that the correct ports and protocols are used for the communications.
      These communications are not allowed in the predefined Firewall Template for Engines.
2. Make sure that the Management Server certificate has not expired.
3. Make sure that your password is correct.