hello guys,
i have problem with exchange 2013 - 2007 mailflow.
recently i added exchange 2013 to our exchange organization everything seems to work fine , well at least for 2 days now exchange 2013 users cant send email to exchange 2007 users and exchnage 07 cant send to exchange 13.
all messages are stuck in queue of both servers.
- i think it's a kerberos problem i activated kerberos logging and there are a lot of kerberos errors. (event id 3 )
- exchange and legacy exchange is enabled on default receive connectors
- exchange 2013 have SmtpReceive warnong with event id 1035 (Inbound Authentication failed with error Target Unknown for Receive connector DefaultFrontend ex13.ex.local. .......authentication mechanism is ExchangeAuth.
- exchange 2013 have SmtpSend Error with Event ID 2017on exchange 2013 i get Core Event ID 3005 (Rpc Htto) Making Client Access 2010 Server .... (i dont have any 2010 server - OA is Disabled on 2007 Servers)
- i checked SPN for both server names are correct but i have multiple duplicate spn's for 2007 server (ex07 - ex07.ex.local)
- Smtp log for send and receive attached to this post
any help would be appreciated
thanks!