Launchd cancels logout/restart and kills app when using screen sharing

I have an app I want to always run so I created a LaunchDaemon to keep it going:
<plist version="1.0">
<dict>
<key>Label</key>
<string>com.sns.sentinel.air</string>
<key>KeepAlive</key>
<true/>
<key>ProgramArguments</key>
<array>
<string>sh</string>
<string>/Applications/oc4j/restartSentinel.sh</string>
</array>
<key>RunAtLoad</key>
<true/>
</dict>
</plist>
And restartSentinel.sh is very simple:
echo Process Sentinel.app is being restarted...
open -W /Applications/oc4j/j2ee/home/applications/Sentinel/Sentinel.app;
Everything seems to be fine but I have to access this machine via screen sharing. Then when I log in, the app gets shut down and only restarted a few minutes later. Also, when another user logs in, they are not able to log off. Launchd seems to cancel the restart.
I do also have two other plist files running other things but they seem to work okay (they don't crash, but the one which needs to be kept alive (code is almost the same as above) also seems to be preventing log out for users other than me).
So how can I get launchd to let people use screen sharing without killing the app and how can I get it to stop canceling logot/restart?

Try the Unix forum (not thread) under OS X Technologies.

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Hi,
this is a brand new Mac Mini server with preinstalled ML and Server.app 2.2.1.
I started the following services: DNS (automatic), OpenDirectory, Sharing, Web and Mail. One additional user and that was it.
After this configuration session, Kerberos seems to be in a non-operable state. See the information below. I can log in locally, can access a share (similar LKDC related error message as below), mail and screen share. But screen share takes ages to start and gives some nasty error messages.
I have almost no knowledge of Kerberos and could use any help to fix-up the Kerberos configuration, preferably without reinstalling.
If there is anything else you need to see about the server configuration, please ask.
Turnin OD off and on again did not change anything. Keeping it off removes the error (obviously) but I think this will not be good for server operations.
Regards, Andreas
Problem statement: accessing the server from a ML client gives the following KDC error sequence before the authentication succeeds. This can take 20-30 seconds.
26.02.13 15:31:21,001 kdc[2321]: Got a canonicalize request for a LKDC realm from 192.168.178.32:59299
26.02.13 15:31:21,001 kdc[2321]: Asked for LKDC, but there is none
26.02.13 15:31:21,001 kdc[2321]: Got a canonicalize request for a LKDC realm from fe80::426c:8fff:fe37:6b28%en0:59300
26.02.13 15:31:21,001 kdc[2321]: Asked for LKDC, but there is none
26.02.13 15:31:21,021 kdc[2321]: Got a canonicalize request for a LKDC realm from 192.168.178.32:59301
26.02.13 15:31:21,021 kdc[2321]: Asked for LKDC, but there is none
26.02.13 15:31:21,021 kdc[2321]: Got a canonicalize request for a LKDC realm from fe80::426c:8fff:fe37:6b28%en0:59302
26.02.13 15:31:21,021 kdc[2321]: Asked for LKDC, but there is none
26.02.13 15:31:32,079 kdc[2321]: Got a canonicalize request for a LKDC realm from 192.168.178.32:59306
26.02.13 15:31:32,079 kdc[2321]: Asked for LKDC, but there is none
26.02.13 15:31:32,080 kdc[2321]: Got a canonicalize request for a LKDC realm from fe80::426c:8fff:fe37:6b28%en0:59307
26.02.13 15:31:32,080 kdc[2321]: Asked for LKDC, but there is none
26.02.13 15:31:32,214 screensharingd[83904]: Authentication: SUCCEEDED :: User Name: Administrator :: Viewer Address: 192.168.178.32 :: Type: DH
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sudo ./checkLocalKDC
krbtgt/LKDC:SHA1.F0454A755D0C818D04161E8547E9D485D004F224@LKDC:SHA1.F0454A755D0C 818D04161E8547E9D485D004F224 doesn't exist, are you sure LKDC:SHA1.F0454A755D0C818D04161E8547E9D485D004F224 is a realm in your databaseThe kadmin check failed.
configureLocalKDC did not fix this. There are Kerberos config files but I cannot determine if they were created before or after starting any of the services.
sudo ls -l krb5kdc/
total 48
-rw------- 1 root wheel    61 21 Feb 19:33 acl_file.MARVIN.DOMAIN.DE
-rw-r--r--@ 1 root wheel   330 26 Feb 20:17 kdc.conf
-rw------- 1 root wheel 4555 20 Feb 19:24 log
-rw------- 1 root wheel   111 20 Feb 19:24 m-key
-rw------- 1 root wheel    78 21 Feb 19:33 m_key.MARVIN.DOMAIN.DE
sudo ktutil list (limited to vnc)
1 aes256-cts-hmac-sha1-96 vnc/LKDC:SHA1.F0454A755D0C818D04161E8547E9D485D004F224@LKDC:SHA1.F0454A755D0C81 8D04161E8547E9D485D004F224
1 aes128-cts-hmac-sha1-96 vnc/LKDC:SHA1.F0454A755D0C818D04161E8547E9D485D004F224@LKDC:SHA1.F0454A755D0C81 8D04161E8547E9D485D004F224
1 des3-cbc-sha1            vnc/LKDC:SHA1.F0454A755D0C818D04161E8547E9D485D004F224@LKDC:SHA1.F0454A755D0C81 8D04161E8547E9D485D004F224
1 aes256-cts-hmac-sha1-96 vnc/[email protected]
1 aes128-cts-hmac-sha1-96 vnc/[email protected]
1 des3-cbc-sha1            vnc/[email protected]
The Kerberos part of the server open directory settings:
dirserv:kerberizedRealmList:availableRealms:_array_index:0:dirNodePath = "/LDAPv3/127.0.0.1"
dirserv:kerberizedRealmList:availableRealms:_array_index:0:realmName = "MARVIN.DOMAIN.DE"
dirserv:kerberizedRealmList:defaultRealm = "MARVIN.DOMAIN.DE"
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After a night of experimentation, I found a workaround but do not know if this simply avoids Kerberos authentication or what is going on.
It can be a domain problem except for the checkLocalKDC error that needs to be fixed anyway.
Above I used the server occurrence in a Finder window, which I presume takes as a name marvin.local.
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Process: iChat [735]
Path: /Applications/iChat.app/Contents/MacOS/iChat
Identifier: com.apple.iChat
Version: 5.0.1 (743)
Build Info: iChat-7430000~2
Code Type: X86 (Native)
Parent Process: launchd [89]
Date/Time: 2010-02-28 18:59:06.521 +0000
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Report Version: 6
Interval Since Last Report: 1278114 sec
Crashes Since Last Report: 24
Per-App Interval Since Last Report: 863061 sec
Per-App Crashes Since Last Report: 22
Anonymous UUID: 890F0781-E477-4575-9FB1-C9DCD4D8B331
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1 com.apple.CoreFoundation 0x96ba5fc2 __CFBasicHashAddValue + 50
2 com.apple.CoreFoundation 0x96bae699 CFBasicHashSetValue + 169
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There are other things we could try that may help.
Try Launching Disk Utility (Applications/Utilities and Setting the tab to First Aid then use the "Repair Permissions" button.
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Launchd cancels logout/restart and kills app when using screen sharing

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