Today's main share is about the transport server port information that is involved in Exchange Server 2010:
Data path |
Required ports |
Default authentication |
Supported authentication |
is encryption supported? |
Is the default encrypted? |
Hub Transport server to Hub Transport server |
25/tcp (SMTP) |
Kerberos |
Kerberos |
Yes, use Transport Layer Security (TLS) |
Is |
Hub Transport server to Edge Transport server |
25/tcp (SMTP) |
Direct Trust |
Direct Trust |
Yes, use TLS |
Is |
Edge Transport server to Hub Transport server |
25/tcp (SMTP) |
Direct Trust |
Direct Trust |
Yes, use TLS |
Is |
Edge Transport server to Edge Transport server |
25/tcp (SMTP) |
Anonymous, certificate |
Anonymous, certificate |
Yes, use TLS |
Is |
Mailbox server to Hub Transport server (through Microsoft Exchange Mail submission Service) |
135/tcp (RPC) |
Ntlm. If the Hub Transport and mailbox server roles are on the same server, Kerberos is used. |
Ntlm/kerberos |
Yes, use RPC encryption |
Is |
Hub Transport server to mailbox server (via MAPI) |
135/tcp (RPC) |
Ntlm. If the Hub Transport and mailbox server roles are on the same server, Kerberos is used. |
Ntlm/kerberos |
Yes, use RPC encryption |
Is |
Unified Messaging server to Hub Transport server |
25/tcp (SMTP) |
Kerberos |
Kerberos |
Yes, use TLS |
Is |
Microsoft Exchange EdgeSync Services (from Hub Transport servers to Edge Transport servers) |
50636/tcp (SSL) |
Basic |
Basic |
Yes, use LDAP on SSL (LDAPS) |
Is |
Active Directory access from a Hub Transport server |
389/TCP/UDP (LDAP), 3268/tcp (LDAP GC), 88/TCP/UDP (Kerberos), 53/TCP/UDP (DNS), 135/tcp (RPC Netlogon) hzwlocked |
Kerberos |
Kerberos |
Yes, use Kerberos encryption |
Is |
Active Directory Rights Management Service (AD RMS) (accessed from a Hub Transport server) |
443/tcp (HTTPS) |
Ntlm/kerberos |
Ntlm/kerberos |
Yes, use SSL |
Is |
From an SMTP client to a Hub Transport server (for example, an end user who uses Windows Live Mail) |
587 (SMTP) |
Ntlm/kerberos |
Ntlm/kerberos |
Yes, use TLS |
Is |
25/tcp (SMTP) |
This article is from the "Clumsy birds have" blog, make sure to keep this source http://tingdongwang.blog.51cto.com/1056852/1642234
Exchange Network Port Reference