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windows/deployment/update/waas-delivery-optimization.md
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@ -134,7 +134,7 @@ For more details, check out the [Adopting Windows as a Service at Microsoft](htt
**Does Delivery Optimization work with WSUS?**: Yes. Devices will obtain the update payloads from the WSUS server, but must also have an internet connection as they communicate with the Delivery Optimization cloud service for coordination. **Does Delivery Optimization work with WSUS?**: Yes. Devices will obtain the update payloads from the WSUS server, but must also have an internet connection as they communicate with the Delivery Optimization cloud service for coordination.
**Which ports does Delivery Optimization use?**: Delivery Optimization listens on port 7680 for requests from other peers by using TCP/IP. The service will register and open this port on the device, but you might need to set this port to accept inbound or outbound traffic through your firewall yourself. If you don't allow inbound or outbound traffic over port 7680, you can't use the peer-to-peer functionality of Delivery Optimization. However, devices can still successfully download by using HTTP or HTTPS traffic over port 80 (such as for default Windows Update data). **Which ports does Delivery Optimization use?**: Delivery Optimization listens on port 7680 for requests from other peers by using TCP/IP. The service will register and open this port on the device, but you might need to set this port to accept inbound and outbound traffic through your firewall yourself. If you don't allow inbound and outbound traffic over port 7680, you can't use the peer-to-peer functionality of Delivery Optimization. However, devices can still successfully download by using HTTP or HTTPS traffic over port 80 (such as for default Windows Update data).
If you set up Delivery Optimization to create peer groups that include devices across NATs (or any form of internal subnet that uses gateways or firewalls between subnets), it will use Teredo. For this to work, you must allow inbound TCP/IP traffic over port 3544. Look for a "NAT traversal" setting in your firewall to set this up. If you set up Delivery Optimization to create peer groups that include devices across NATs (or any form of internal subnet that uses gateways or firewalls between subnets), it will use Teredo. For this to work, you must allow inbound TCP/IP traffic over port 3544. Look for a "NAT traversal" setting in your firewall to set this up.