Lync Server 2010 Firewall Ports for Consolidated Edge Architecture

April 2016 Update >> Migrate to Skype Cloud PBX for Free------------ The Lync Server 2010, Edge Server functionality described in this reference architecture is very similar to what was first introduced in Office Communications Server 2007 R2, with the following exceptions:

• Port 8080 is used to route traffic from the reverse proxy internal interface to the pool virtual IP (VIP)
• Port 4443 is used to route traffic from the reverse proxy internal interface to the pool VIP
• Port 4443 is used to route traffic from the pool front end(s) to the Edge internal interface

There are several options for the 50,000 – 59,999 port ranges, but the following figure shows the common configuration for interoperability with previous versions of Office Communications Server. For details about the options for configuring this port range, see “A/V Edge Service Port Range (50,000 – 59,999) Requirements” in Determining External A/V Firewall and Port Requirements.

Enterprise perimeter network for single consolidated edge

Firewall Summary for Single/Scaled Consolidated Edge with DNS Load Balancing: External Interface

Protocol/Port	Used for
HTTP 80 (out)	Checking certificate revocation lists
DNS 53 (out)	External DNS queries
SIP/TLS/443 (in)	Client to server SIP traffic for remote user access
SIP/MTLS/5061 (in/out)	Federation and connectivity with a hosted Exchange service
PSOM/TLS/443 (in)	Remote user access to conferences for anonymous and federated users
RTP/TCP/50K range (in)	Media exchange (for details, see Determining External A/V Firewall and Port Requirements) and Windows Live Messenger if public IM connectivity is enabled Required for Office Communications Server 2007 R2 interoperability
RTP/TCP/50K range (out)	Media exchange (for details, see Determining External A/V Firewall and Port Requirements) Required for Office Communications Server 2007 R2 interoperability Required for Office Communications Server 2007 R2 desktop sharing and federation Required for Lync Server 2010 application sharing, file transfer, or A/V with Windows Live Messenger
RTP/UDP/50K range (in)	Media exchange (for details, see Determining External A/V Firewall and Port Requirements)
RTP/UDP/50K range (out)	Media exchange (for details, see Determining External A/V Firewall and Port Requirements) or A/V with Windows Live Messenger Required for Office Communications Server 2007 interoperability
STUN/MSTURN/UDP/3478 (in/out)	External user access to A/V sessions (UDP)
STUN/MSTURN/TCP/443 (in)	External user access to A/V sessions and media (TCP)

Firewall Details for Single/Scaled Consolidated Edge with DNS Load Balancing: Internal Interface

When reading the preceding tables, (in) refers to traffic going from a less trusted network to a more trusted network, such as Internet-to-perimeter or perimeter-to-corporate). For example, traffic from the Internet to the Edge external interface or from the Edge internal interface to the next hop pool. (out) refers to traffic going from a more trusted network to a less trusted network, such as corporate-to-perimeter or perimeter-to-Internet). For example, traffic from a corporate pool to the Edge internal interface or from the Edge external interface to the Internet. And, (in/out) refers to traffic that is going both directions.

Inbound/Outbound edge traffic

We recommend that you open only the ports required to support the functionality for which you are providing external access. For remote access to work for any edge service, it is mandatory that SIP traffic is allowed to flow bidirectionally as shown in the Inbound/Outbound edge traffic figure. Stated another way, the Access Edge service is involved in instant messaging (IM), presence, web conferencing, and audio/video (A/V).

Firewall Details for Reverse Proxy Server: External Interface

Protocol/Port	Use for
HTTP 80 (in)	(Optional) Redirection to HTTPS if user accidentally enters https://<publishedSiteFQDN>
HTTPS 443 (in)	Address book downloads, Address Book Web Query service, client updates, meeting content, device updates, group expansion, dial-in conferencing, and meetings.

Firewall Details for Reverse Proxy Server: Internal Interface

Protocol/Port	Used for
HTTPS 4443 (in)	Traffic sent to 443 on the reverse proxy external interface is redirected to a pool on port 4443 from the reverse proxy internal interface so that the pool web services can distinguish it from internal web traffic
Note:
When reading the previous tables, (in) refers to traffic going from a less trusted network to a more trusted network, such as Internet-to-perimeter or perimeter-to-corporate). For example, traffic from Internet to the reverse proxy external interface or from the reverse proxy internal interface to a Standard Edition pool or a hardware load balancer VIP associated with a Front End pool.

External Ports Settings Required for Single Consolidated Edge Topology

Internal Ports Settings Required for Single Consolidated Edge Topology