I have a problemwith a multisite a client of mine has asked

Hi,
I have a problemwith a multisite a client of mine has asked for help with.
I can do manual index and cron is working but some of the sites in the network does not get indexed at all although they are added to be indexed.

I need some advice and a follow up on this thread, thanks.

I can post more specifics of the site in private messages.