Office 365: New port/URL required for OWA in Exchange Online

Below is a screenshot taken from Fiddler, when I open an OWA session against Exchange Online:


As you can see, besides port 443 against the misc. URLs, we now also establish a connection to “” via port “10106”.

This information is important for all customers, but especially for those that use OWA from the internal network (Kiosk users) and have configured client-side port restrictions.

The documentation will be updated with this information soon.

Until later,
Henrik Walther

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