Lync Online for Office 365 Firewall Requirements

As of the 7th November 2013 the following are the requirements of Lync Online for Office 365, note this information can change as the service evolves. This is from the clients machine to Office 365

Firewall Ports

Port Protocol Client Usage Direction

443

TLS/PSOM

Data Sharing Sessions

Outbound

443

STUN/TCP

Audio, Video and Application   sharing sessions

Outbound

3478

STUN/UDP

Audio and Video Sessions

Outbound

5223

TCP

Lync Mobile push notifications

Outbound

50000 TO 50039 INCLUSIVE

RTC/UDP

Audio and Video Sessions

Outbound

50040 TO 50059 INCLUSIVE

TCP

Application Sharing and File   Transfer

Outbound

The following is the URL’s that Lync Online from the client will use to get to the Lync Online servers so if the traffic is going through internet proxies and you are having issues these URL’s will be helpful:

*.online.lync.com

*.onmicrosoft.com

*.infra.lync.com

*.lync.com

evsecure-ocsp.verisign.com

evsecure-aia.verisign.com

evsecure-crl.verisign.com

Finally the last point is if your firewall guys want to lock down access to specific IP addreses (although NOT recommended due to the fact these can be changed)

65.54.54.128/25

65.55.121.128/27

65.55.127.0/24

111.221.17.128/27

111.221.22.64/26

111.221.23.0/25

111.221.76.96/27

111.221.76.128/25

111.221.77.0/26

132.245.0.0/16

157.55.40.128/25

157.55.46.0/27

157.55.46.64/26

157.55.104.96/27

157.55.229.128/27

157.55.232.128/26

157.55.238.0/25

207.46.5.0/24

207.46.7.128/27

207.46.57.0/25

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