Server app on Mavericks broken on a Time Machine recovery

Question

Have installed a replacement hard drive in my iMac and recovered from my most recent Time Machine backup.
Everything seems to have gone well except for the Server app, which is now unusable.
On starting Server I get my first error:
“An error occurred while updating your service data”
Click continue, spinning wheel in the dialogue box.
When connecting to server I get a second error; select “This machine”, log in with previous credentials (an admin user):
“Server requires administrator login
The user is not permitted to administer this server. Make this user an administrator on this server and try again”
The user account I am using IS an administrator on this computer.
I’ve tried a full recovery from the Time Machine backup twice now.
Any suggestions? My thoughts are it could be a Keychain issue, but I'm not sure.

Answer 1

From /var/log/server.log:
Dec 12 17:16:10 --- last message repeated 1 time ---
Dec 12 17:16:10 mac01.local servermgrd[1695]: [1695] error in getAndLockContext: open returned -1 (errno=1)  file was /private/var/servermgrd//servermgr_config.lock
Dec 12 17:16:10 mac01.local servermgrd[1695]: [1695] error in getAndLockContext: open returned -1 (errno=1)  file was /private/var/servermgrd//servermgr_certs.lock
Dec 12 17:16:10 mac01.local servermgrd[1695]: Exception in doCommand for module servermgr_info on thread 0x7ff4fa719bd0: *** setObjectForKey: object cannot be nil (key: identityCertificates)