LDAP Bind was unseccessful on directory <servername> Directory returned error:[0x51] Server Down.
Posted on 2007-03-30
We have a server 2003/2000 environment with about 60-70 users. We are running one Exchange 2003 server.
This server also works as the DHCP server. We have 2 Domain controllers. Server A and Server B.
Lately I have been noticing errors on the mail server from time to time. The error is as follows
LDAP Bind was unsuccessful on directory ServerA@domain.local for distinguished name ''. Directory returned error:[0x51] Server Down.
I get the same error message in reference that Server B is down as well.
This error will show up a lot during times but eventually will work itself out. If I leave it how it is it will fix itself. However it will come back after so long.
While this error is occurring I am not able to open AD Users and computers and I am not able to open the Exchange system manager.
I have verified that I can establish connection between both Domain Controllers while this is going on. I have also checked DNS to make sure it is pointing in the right direction. I have searched online with little luck.
There is a twist to this problem as well.
On the GC Server, AKA Server A I receive errors in the security log from my exchange server.
Here is one of the errors
Object Server: DS
Operation Type: Object Access
Object Type: dnsNode
Object Name: DC=151,DC=1.168.192.in-addr.arpa,CN=MicrosoftDNS,CN=System,DC=<domain>,DC=local
Handle ID: -
Primary User Name: SERVERA$
Primary Domain: <DOMAIN>
Primary Logon ID: (0x0,0x3E7)
Client User Name: ExchangeServer$
Client Domain: <Domain>
Client Logon ID: (0x0,0xDCD57A)
Accesses: Write Property
Default property set
Access Mask: 0x20
The event ID is 566.
I am not sure why I am receiving these errors.
My goal is to keep my Exchange server working. In my mind if it was any kind of authentication error it would happen all the time and would not fix itself.
I hope this provides enough information.