To solve the SSL certificate issue:

1.  Go to the SSFE server system.
2. Verify the disk and make sure the available space is not 0 using the command:
       

   safesync@appliance1:/$ df -h

3. Check if the EU and Admin console key match:
   

   safesync@appliance1:/opt/SingleInstaller/MgmtUI/SSL$ openssl rsa -noout -modulus -in mgmt.key | openssl md5
   safesync@appliance1:/opt/SingleInstaller/MgmtUI/SSL$ openssl rsa -noout -modulus -in mgmt.crt | openssl md5
   safesync@appliance1:/opt/TrendMicro/OSDP/SSL$ openssl rsa -noout -modulus -in safesync.lport.key | openssl md5
   safesync@appliance1:/opt/TrendMicro/OSDP/SSL$ openssl x509 -noout -modulus -in safesync.lport.crt | openssl md5

   The four results should be the same.

4. If there is a key mismatch in /MgmtUI/SSL, do the following to resolve the issue:

   1. Go to /opt/SingleInstaller/MgmtUI/SSL/ Back up to back up mgmt.crt and mgmt.key to another location.
   2. Remove the mgmt.crt and mgmt.key under /opt/SingleInstaller/MgmtUI/SSL/
      root@appliance1:/opt/SingleInstaller/MgmtUI/SSL# rm mgmt.*
   3. Copy safesync.lport.key and safesync.lport.crt to /opt/SingleInstaller/MgmtUI/SSL/
      root@appliance1:/opt/SingleInstaller/MgmtUI/SSL# cp /opt/TrendMicro/OSDP/SSL/safesync.lport.* /opt/SingleInstaller/MgmtUI/SSL/.
   4. Rename safesync.lport.key and safesync.lport.crt to mgmt.key and mgmt.crt
      root@appliance1:/opt/SingleInstaller/MgmtUI/SSL# mv safesync.lport.crt mgmt.crt | mv safesync.lport.key mgmt.key.
   5. Restart apache2 (command: sudo service apache2 restart)
      root@appliance1:/opt/SingleInstaller/MgmtUI/SSL# service apache2 restart