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Recently, my Omnifocus sync with my WEBDav database broke.  I was getting “Internal Server Errors” when trying to sync, and saw the following errors in my apache2/error.log:

[Sat Apr 30 11:18:39 2011] [error] [client] The locks could not be queried for verification against a possible “If:” header.  [5\
00, #0]
[Sat Apr 30 11:18:39 2011] [error] [client] Could not open the lock database.  [500, #400]
[Sat Apr 30 11:18:39 2011] [error] [client] (17)File exists: Could not open property database.  [500, #1]

The solution:

Go into your apache2 httpd.conf file and find the line beginning with: DAVLockDB.

Make sure the file specified on that line exists.  If not, you can create it:

$ sudo touch /var/lock/apache2/DAVLock
$ sudo chown www-data /var/lock/apache2/DAVLock

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if that was helpful ...

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