macOS Sierra Finder doesn't automatically authorize network-mapped folders on login
There is an update from Apple. 


  When connecting to a server that requires a user name and password,
  macOS Sierra 10.12 or later asks you to click Connect, even when the
  name and password have been saved in your keychain. This helps you to
  avoid transmitting login credentials to a server you didn't intend to
  connect to.


If you want to disable this security feature so that you can connect without providing additional confirmation, follow these steps:


Update to macOS Sierra 10.12.2
Open the Terminal app
Enter the following command: sudo defaults write /Library/Preferences/com.apple.NetworkAuthorization AllowUnknownServers -bool YES
Enter your administrator name and password when prompted


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To disable this command and return to the previous more secure behaviour, follow these steps:


Open the Terminal app
Enter the following command: sudo defaults delete /Library/Preferences/com.apple.NetworkAuthorization AllowUnknownServers
Enter your administrator name and password when prompted