On Wed, 19 Nov 2008, Dmitriy Kirhlarov wrote:
Could somebody recommend me how to debug this issue or change some parameters?
Well, first, make sure you're up to patch. 2.4.12, and maybe if there's anything in the ITS that looks relevant, you should make some local additions.
"loglevel sync" is a good place to start. You can find ldifdiff.pl in CPAN, that might be good for pointing out what entries to look for (or look for the absence of) in the logs.