Xcode 9 enable Server fails because "xcsd" keychain password

I tried all of the above... however the only thing that worked for me was resetting the entire server with this command. Open terminal and try:

sudo /Applications/Xcode.app/Contents/Developer/usr/bin/xcscontrol --reset

This command saved me from giving up!!

Only working solution for me:

• Backup the folder /Library/Developer/XcodeServer/
• Remove it
• Activate Xcode Server

Keep in mind that the new Xcode server doesn't have hosted repositories anymore, so if used them, they are in the HostedRepositories folder. You have to move them to a different service (eg. github).