Yosemite Server: After upgrade, OD is read-only

Hello,
yesterday, I upgraded my server installation to Yosemite and Server 4.0. Although it seemed that everything went fine, a severe problem turned out.
Symptoms:
I cannot login to network accounts from other machines, although Directory Services show the right content for each user. Assumption: Kerberos authentication fails for unknown reason.
Then, I discovered that OD on the Yosemite Server shows all Users and Groups, but I cannot edit any of them; any "change password" or similar context menu options are grayed out.
I had the "fix permissions" run and reboot, but without any effect.
As it seems, the /Library/Server path content is considered as read-only for the Server app; this impression is supported by the RADIUS service: When keying "radiusd -X", this is the result:
Starting - reading configuration files ...
including configuration file /Library/Server/radius/raddb/radiusd.conf
Unable to open file "/Library/Server/radius/raddb/radiusd.conf": Permission denied
Errors reading or parsing /Library/Server/radius/raddb/radiusd.conf
Any idea how to fix this? I'm not the hardcore sysadmin, so I'd appreciate any kind of help...
Thanks a lot in advance!
Best regards,
Hardy

Addition: I just found out that a login request from a client to the read-only OD leads to these system protocol entries:
Oct 18 07:41:49 odserver.domain.tld kdc[69]: AS-REQ [email protected] from 10.0.10.55:57714 for krbtgt/[email protected]
Oct 18 07:41:52 --- last message repeated 1 time ---
Oct 18 07:41:52 odserver.domain.tld kdc[69]: UNKNOWN -- krbtgt/[email protected]: no such entry found in hdbOct 18 07:41:52 odserver.domain.tld kdc[69]: AS-REQ [email protected] from 10.0.10.55:57875 for krbtgt/[email protected]
Oct 18 07:41:52 odserver kdc[69]: BUG in libdispatch client: kevent[EVFILT_READ] delete: "Bad file descriptor" - 0x9Oct 18 07:41:52 odserver.domain.tld kdc[69]: AS-REQ [email protected] from 10.0.10.55:57875 for krbtgt/[email protected]
Oct 18 07:41:52 odserver.domain.tld kdc[69]: UNKNOWN -- krbtgt/[email protected]: no such entry found in hdbOct 18 07:41:52 odserver.domain.tld sandboxd[328] ([69]): kdc(69) deny file-read-data /private/etc/krb5.conf
Oct 18 07:41:57 odserver kernel[0]: Sandbox: Python(5581) System Policy: deny file-write-unlink /Library/Server/Wiki/PostgresSocket/.xpg_ctl.pidOct 18 07:42:08 odserver.domain.tld collabpp[5578]: Failed to obtain sandbox extension for path=/dev/null/Library/Caches/collabpp. Errno:20

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