Exteral Users can't connect to the EDGE server

HI All for about a week and half now I've been seeing this error a lot on my event logs. All my external users are no longer able to connect to the DMZ EDGE server with 3 external IP's. They can only use LYNC if they access out VPN. Any suggestions on what
may be the issue???
Log Name:      Lync Server
Source:        LS Protocol Stack
Date:          4/24/2014 9:07:14 AM
Event ID:      14428
Task Category: (1001)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      LyncEdge.*********.net
Description:
TLS outgoing connection failures.
Over the past 16 minutes, Lync Server has experienced TLS outgoing connection failures 176 time(s). The error code of the last failure is 0x80090330(SEC_E_DECRYPT_FAILURE) while trying to connect to the server "**********.osis.is.local" at address
[10.111.111.8:5061], and the display name in the peer certificate is "Unavailable".
Cause: Most often a problem with the peer certificate or perhaps the host name (DNS) record used to reach the peer server. Target principal name is incorrect means that the peer certificate does not contain the name that the local server used to connect. Certificate
root not trusted error means that the peer certificate was issued by a remote CA that is not trusted by the local machine.
Resolution:
Check that the address and port matches the FQDN used to connect, and that the peer certificate contains this FQDN somewhere in its subject or SAN fields. If the FQDN refers to a DNS load balanced pool then check that all addresses returned by DNS refer to
a server in the same pool. For untrusted root errors, ensure that the remote CA certificate chain is installed locally. If you have already installed the remote CA certificate chain, then try rebooting the local machine.
Thanks Dave Wolf

Verify root certs exist in the Trusted Root Certification Store.
Also you can refer below links
http://www.shudnow.net/2011/02/01/lync-2010-edge-utilizing-windows-server-2008-r2-federation-tls-issues/
http://theucguru.blogspot.com/2012/03/lync-edge-ls-protocol-stack-14428.html
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question, please click "Mark As Answer"
Mai Ali | My blog: Technical

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