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no free leases for existing pc's

We have two dhcp failover servers and today noticed in the log files one of the servers reporting peer holds all leases and the other saying not authoritiive.  There are free leases available on the subnets, the problem occurs with existing pc's already registered, registereing new pc's is worknig fine.  we tried release an existing ip on a pc that was working and renewing and it wouldn;t allow messages on dhcp service log was - discover only thats as far as it got, there ahve been no changes made over the last few weeks apart from one minor change to the dhcp master file which was editing an ip subnet i ahve checked to see if there are any other changes to that file and the only thing i could find as it was not me who made the change was the time stamp on our dhcp managemtn server (which is also our ntp server) had the correct time stamp on the master dhcp file but when i checked the time stamp on the master file on the dhcp files it was different and had an older time-4 hours prior to this, i dont think this is the reason but i thought maybe worth noting.  Neither of the servers have been rebooted, nor have dhcp.leases purged, not sure what route to go down, theya re pretty old servers.  Thank in advance for any assistance with this.
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BesteKeeper
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BesteKeeper
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gheistCommented:
Does it help to merge lease files on one server and switch other off for lease period?
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BesteKeeperAuthor Commented:
What i am going to try is stopping dhcp on one of the servers for 5 mins or so to see if this helps the confusion that  appears between the two.  
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BesteKeeperAuthor Commented:
they are both reporting 'peer holds all free leases'
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gheistCommented:
Does it help to merge lease files on one server, work a day with that server and then re-establish peering?
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BesteKeeperAuthor Commented:
problem now solved -  both dhcp servers were out of time sync causing rejecting of failover, servers now synced and issuing ip's again.
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BesteKeeperAuthor Commented:
problem now solved -  both dhcp servers were out of time sync causing rejecting of failover, servers now synced and issuing ip's again
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gheistCommented:
Glad you solved the problem.
You can do checking if client machines do time sync on stime server, so that you automatically know what goes down for long.
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