In some instances, Remote Login and Screen Sharing might be disabled after updating. To resolve this issue, use OS X Server to re-enable these features. If these options already appear to be enabled, disable and re-enable them again.
OS X Server: Remote Login and Screen Sharing disabled after updating
After updating your server to OS X version 10.9.5, you might not be able to connect to your server using screen sharing or remote login over SSH.
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