Hi,

I would like to request for assistance. This has been an issue last year and we have tried several codes or script but to no avail. Here are the error messages on the logs of our Exchange Server:

Failed to connect to the Edge Transport server ADAM instance with exception The LDAP server is unavailable..  This could be caused by a failure to resolve the Edge Transport server name edgeserver.domain.com in DNS, a failure trying to connect to port 50636 on edgeserver.domain.com, network connectivity issues, an invalid certificate, or an expired subscription.  Verify your network and server configuration.

Also encountering this error message on our Anti-spam but Im not sure if this is related with the 1^st one:

antispam postfix/smtp[28694]: certificate verification failed for 10.10.0.XX[10.10.0.XX]:25: untrusted issuer /CN=PVBHO1PRDEDGE01

Additional: This is for exchange 2010 not 2013 sorry because I cant find 2010 in the choices.

• Edited by Dubista Monday, April 20, 2015 4:59 AM

Hi Dubista,

Thank you for your question.

By two errors, we suggest you make sure the same certificate is installed on Hub and Edge Transport server, run the following command on both servers and compare the certificate thumbprints:

Get-TransportServer <Server Name> | Format-List Name,InternalTransportCertificateThumbprint

If not, we could reassign the certificate for Exchange Edge server.

If the issue persist, we could refer to the following link to troubleshoot:

1.        We could rebuild Edge subscription to check if the issue persist.
2.        Then check if DNS server could resolve the FQDN of Edge server
3.        Check if the port 50636 and 50389 are opened on Edge server

We could refer to the following link:

https://technet.microsoft.com/en-us/library/cc671171(EXCHG.80).aspx

If there are any questions regarding this issue, please be free to let me know. 

Best Regard,

Jim