For customers who connect their remote worker devices to the corporate network or cloud infrastructure over VPN, Microsoft recommends that the key Office scenarios Microsoft TeamsSharePoint Online and Exchange Online are routed over a VPN split tunnel configuration. This becomes especially important as the first line strategy to facilitate continued employee productivity during large scale work-from-home events such as the COVID crisis.
Figure 1: A VPN split tunnel solution with defined Office exceptions sent directly to the service. All other traffic traverses the VPN tunnel regardless of destination. The essence of this approach is to provide a simple method for enterprises to mitigate the risk of VPN infrastructure saturation and dramatically improve Office performance in the shortest timeframe possible. Configuring VPN clients to allow the most critical, high volume Office traffic to bypass the VPN tunnel achieves the following benefits:.
Immediately mitigates the root cause of a majority of customer-reported performance and network capacity issues in enterprise VPN architectures impacting Office user experience. Traffic to these endpoints is highly sensitive to latency and bandwidth throttling, and enabling it to bypass the VPN tunnel can dramatically improve the end user experience as well as reduce the corporate network load.
Office connections that do not constitute the majority of bandwidth or user experience footprint can continue to be routed through the VPN tunnel along with the rest of the Internet-bound traffic. For more information, see The VPN split tunnel strategy.
Can be configured, tested and implemented rapidly by customers and with no additional infrastructure or application requirements. Depending on the VPN platform and network architecture, implementation can take as little as a few hours. For more information, see Implement VPN split tunneling. Preserves the security posture of customer VPN implementations by not changing how other connections are routed, including traffic to the Internet.
The recommended configuration follows the least privilege principle for VPN traffic exceptions and allows customers to implement split tunnel VPN without exposing users or infrastructure to additional security risks.
Network traffic routed directly to Office endpoints is encrypted, validated for integrity by Office client application stacks and scoped to IP addresses dedicated to Office services which are hardened at both the application and network level.
For more information, see Alternative ways for security professionals and IT to achieve modern security controls in today's unique remote work scenarios Microsoft Security Team blog. Microsoft continues to collaborate with industry partners producing commercial VPN solutions to help partners develop targeted guidance and configuration templates for their solutions in alignment with the above recommendations.
Microsoft recommends focusing split tunnel VPN configuration on documented dedicated IP ranges for Office services. The use of FQDN configuration may be useful in other related scenarios, such as. Traditional corporate networks are often designed to work securely for a pre-cloud world where most important data, services, applications are hosted on premises and are directly connected to the internal corporate network, as are the majority of users.
Thus network infrastructure is built around these elements in that branch offices are connected to the head office via Multiprotocol Label Switching MPLS networks, and remote users must connect to the corporate network over a VPN to access both on premises endpoints and the Internet.
In this model, all traffic from remote users traverses the corporate network and is routed to the cloud service through a common egress point. Figure 2: A common VPN solution for remote users where all traffic is forced back into the corporate network regardless of destination. As organizations move data and applications to the cloud, this model has begun to become less effective as it quickly becomes cumbersome, expensive and unscalable, significantly impacting network performance and efficiency of users and restricting the ability of the organization to adapt to changing needs.
The COVID crisis has aggravated this problem to require immediate solutions for the vast majority of organizations. Rapid solutions are required for these organization to continue to operate efficiently.
For the Office service, Microsoft has designed the connectivity requirements for the service with this problem squarely in mind, where a focused, tightly controlled and relatively static set of service endpoints can be optimized very simply and quickly so as to deliver high performance for users accessing the service, and reducing the burden on the VPN infrastructure so it can be used by traffic which still requires it.
Office categorizes the required endpoints for Office into three categories: OptimizeAllowand Default. Optimize endpoints are our focus here and have the following characteristics:. This tightly scoped set of endpoints can be split out of the forced VPN tunnel and sent securely and directly to the Office service via the user's local interface. This is known as split tunneling. Security elements such as DLP, AV protection, authentication and access control can all be delivered much more efficiently against these endpoints at different layers within the service.
As we also divert the bulk of the traffic volume away from the VPN solution, this frees the VPN capacity up for business critical traffic which still relies on it. It also should remove the need in many cases to go through a lengthy and costly upgrade program to deal with this new way of operating.Prior to federating the domain this week we had some pilot users setup with Cloud only accounts. Up until the users were federated access to all O services appeared to be working normally.
We have a Websence proxy that filters all internet traffic, but all O URLs are configured to bypass the proxy and go straight to the firewall. Since the federation maybe a coincidence we're experiencing many issues with O services and sites being blocked by our firewall.
Our firewall blocks all outgoing traffic on Port by default unless it matches a specific rule. I have configured outbound rules as per the link below and allowed all listed IP addresses. However I'm seeing many IP addresses being blocked when accessing O and OneDrive that are not listed in the article above. Please can you give me some advice on how we should deal with this. Is there a definitive list of IPs used by O that can be added to our Firewall for outbound traffic on portincluding those used by CDN providers?
How do other people solve this problem? Because the Spoprod-a. We cannot provide a fixed IP for it. So, we suggest you bypass the Spoprod-a.
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This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread. I have the same question Thanks for your understanding. Regards, Iris. Thanks for marking this as the answer.Since it's recommended to bypass any lan proxy when working with O has anyone got a definitive list for Exchange? We use Outlook and have been plagued by annoying credential popups which I'm thinking because we haven't bypassed our proxy. To continue this discussion, please ask a new question.
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We found 4 helpful replies in similar discussions:. Fast Answers! Huw Nov 11, Yes, you can do exactly what you've described. This for WSM Open Policy Manager.
Add Policy. Click Add. In the Policy Properties Screen give your policy a name e. Was this helpful? Examples: See all 4 answers. Popular Topics in Microsoft Office Spiceworks Help Desk. The help desk software for IT.
Track users' IT needs, easily, and with only the features you need. ErikN This person is a verified professional. This topic has been locked by an administrator and is no longer open for commenting. Read these nextDocumentation Support. Adding and importing sites that bypass the proxy.
The Proxy Bypass tab of the Bypass Settings page enables you to define sites that bypass the cloud service for all policies. This may include, for example, internal sites that are not accessible from the Internet, so the cloud service cannot serve or analyze them. A proxy bypass destination can be a domain name, an IP address, or a subnet. Both the Proxy Connect and Direct Connect endpoint clients use the bypass definitions.
In the case of the Direct Connect endpoint, destinations in the bypass list are not analyzed by the cloud service. When a PAC file is used to direct traffic through the cloud proxy, configured destinations are added to the PAC file for your organization.
Recommended bypass destinations include organizational webmail sites, internal IP addresses, and system traffic such as Microsoft and antivirus updates. If remote browser isolation is configured, the provider IP address or domain name is automatically added as a bypass destination.
If your organization uses Microsoft Officeselect the Office box under Cloud Applications and click Save to bypass the cloud service for sites and URLs associated with Office The URLs included in the bypass list for Office are those domains that are owned by Microsoft and used directly by the Office application, listed here:.
Bypassing these domains may not be appropriate for all customers. If you have difficulty installing or using Office with this option selected, you may need to add one or more of these additional URLs as non-proxied domains. If you need further assistance, please contact Technical Support. You can also configure policy-specific bypass destinations on the Connections tab of each policy.
For more information, see Proxy bypass. Enter a Name and helpful Description for the destination. If the traffic should bypass the cloud proxy, but go through a third-party proxy in your network, mark Send traffic to another proxy. Use the optional Comment box to add helpful information, such as why the entry was created. Click Import Destinations. Click the CSV template link, and save the template in a location of your choice.
Add the bypass destination information to the template file. The template file contains the following columns: Name, Type, Destination, and Description. Only Description is optional; all other columns must be filled in. For example:. Dest3 Subnet Most enterprise organizations that have multiple office locations and a connecting WAN will need to need configuration for Office network connectivity. You can optimize your network by sending all trusted Office network requests directly through your firewall, bypassing all additional packet level inspection or processing.
This reduces latency and your perimeter capacity requirements. Identifying Office network traffic is the first step in providing optimal performance for your users.
For more information about Office network connectivity, see Office Network Connectivity Principles. Regardless of how you manage vital Office network traffic, Office requires Internet connectivity. How you use the Office network endpoints will depend on your enterprise organization network architecture. This article outlines several ways that enterprise network architectures can integrate with Office IP addresses and URLs.
The easiest way to choose which network requests to trust is to use SDWAN devices that support automated Office configuration at each of your office locations. At each branch office location, you can provide an SDWAN device that is configured to route traffic for Office Optimize category of endpoints, or Optimize and Allow categories, directly to Microsoft's network. Other network traffic including on-premises datacenter traffic, general Internet web sites traffic, and traffic to Office Default category endpoints is sent to another location where you have a more substantial network perimeter.
Microsoft 365 and Office 365 URLs and IP address ranges
For more information, see Office Networking Partner Program. Typical network requests that are sent through a proxy or perimeter device increase latency. While SSL Break and Inspect creates the largest latency, other services such as proxy authentication and reputation lookup can cause poor performance and a bad user experience. Additionally, these perimeter network devices need enough capacity to process all of the network connection requests.
We recommend bypassing your proxy or inspection devices for direct Office network requests. You can modify the script so that it integrates with your existing PAC file management. The PAC file is deployed to web browsers at point 1 in Figure 1. When using a PAC file for direct egress of vital Office network traffic, you also need to allow connectivity to the IP addresses behind these URLs on your network perimeter firewall.
Office 365 - Firewall / IPs / CDN
The firewall is point 3 in Figure 1. Separately if you choose to only do direct routing for the Optimize category endpoints, any required Allow category endpoints that you send to the proxy server will need to be listed in the proxy server to bypass further processing.
The proxy server is point 2 in Figure 1. The common configuration is to permit without processing all outbound traffic from the proxy server for the destination IP addresses for Office network traffic that hits the proxy server.
Where PAC files are not used for direct outbound traffic, you still want to bypass processing on your network perimeter by configuring your proxy server. Some proxy server vendors have enabled automated configuration of this as described in the Office Networking Partner Program.
If you are doing this manually you will need to get the Optimize and Allow endpoint category data from the Office IP Address and URL Web Service and configure your proxy server to bypass processing for these.
In addition to selecting appropriate configuration for your network perimeter, it is critical that you adopt a change management process for Office endpoints. These endpoints change regularly and if you do not manage the changes, you can end up with users blocked or with poor performance after a new IP address or URL is added.When we talk about Office services with our customers, a lot of the discussion revolves around the networking components.
One area that we typically have a lot of talks on is the proxy environment. However, all Office traffic is encrypted, so aside from seeing the request URL, none of the content will be visible.
Office applications such as Outlook were originally designed for LAN environments and consequently, still sometimes behave like that. An Outlook client with a few open mailboxes and a GAL query may consume 10 or 15 sessions by itself on the proxy sever; at some point, with enough users doing this, you will exhaust the resources in your proxy environment for no discernable benefit.
Successfully bypassing your proxy requires two parts:. Some modern firewalls include URL filtering, but many in the field do not. Once you deploy a Proxy PAC file, you need to keep it up to date which can be tedious. I have attempted to kill both of those birds with this script. You can download the full script below over at the TN Gallery. Helping companies conquer inferior technology since I spend my time developing and implementing technology solutions so people can spend less time with technology.
View all posts by Aaron Guilmette. I am rewriting it. Hi All, We are unable to activate office application via proxy pac file, license file is not getting download from pac file but if select only proxy address, getting activate, if i select only pac file getting unlicensed error, need your help to resolve this.Ford factory pinstriping
Make sure that if you are bypassing the proxy that you allow the endpoints via the Firewall. How to deploy officeproxy. We changed the way proxy settings are delivered since we no longer use the Internet Explorer Maintenance or Internet Explorer Administration Kit. Hi, I tried to generate a proxy. Thanks for your help.
The default. Just make sure you allow those ports outbound on your firewall. Hi Aaron, Thanks for your reply their are no restriction in firewall for outbound ports. Once the request reach by the client through proxy pac on the proxy server mentioned over then all ports are open. Log onto incoming mail server pop3 : Cannot find the email server. Verify the server information in your account properties Send test e-mail message: Cannot find the e-mail server. Verify the server information in your account properties.
What is the client? And what does the network infrastructure look like? Typically, only browser-based requests will make it to a proxy that is defined explicitly.
Policy-based routing can also affect your network path. Once the client reach over the proxy then all the ports are open from their. I just posted in Microsoft community as well but they also redirected you as your one of the expert in Proxy Pac. Just looking for something to achieve this.Office requires connectivity to the Internet.
This moratorium is intended to provide customer IT teams with confidence and simplicity in implementing recommended network optimizations for work-from-home Office scenarios. Changes within other endpoint categories will occur as usual. During this period, customers can use Office Optimize category service endpoint definitions in a static manner to perform targeted network optimizations such as bandwidth reservations or split tunnel VPN configuration with minimal risk to Office connectivity due to cloud-side network changes.
This new service will help you configure and update network perimeter devices such as firewalls and proxy servers. You can download the list of endpoints, the current version of the list, or specific changes.
This service replaces the XML document linked from this page, which was deprecated on October 2, To try out this new service, go to Web service. Government DoD Office U. Government GCC High.Yamaha rx a1090
Start with Managing Office endpoints to understand our recommendations for managing network connectivity using this data. Endpoints data is updated at the beginning of each month with new IP Addresses and URLs published 30 days in advance of being active. This allows for customers who do not yet have automated updates to complete their processes before new connectivity is required. Endpoints may also be updated during the month if needed to address support escalations, security incidents, or other immediate operational requirements.
The data shown on this page below is all generated from the REST-based web services. If you are using a script or a network device to access this data, you should go to the Web service directly.
Endpoint data below lists requirements for connectivity from a user's machine to Office It does not include network connections from Microsoft into a customer network, sometimes called hybrid or inbound network connections.
Office 365 URLs and IP address ranges
See Additional endpoints for more information. The endpoints are grouped into four service areas. The first three service areas can be independently selected for connectivity. The fourth service area is a common dependency called Microsoft Common and Office and must always have network connectivity.
ID : The ID number of the row, also known as an endpoint set. This ID is the same as is returned by the web service for the endpoint set. Category : Shows whether the endpoint set is categorized as "Optimize", "Allow", or "Default".
You can read about these categories and guidance for management of them at New Office endpoint categories.
Managing Office 365 endpoints
This column also lists which endpoint sets are required to have network connectivity. For endpoint sets which are not required to have network connectivity, we provide notes in this field to indicate what functionality would be missing if the endpoint set is blocked. If you are excluding an entire service area, the endpoint sets listed as required do not require connectivity. The BGP community that includes the route prefixes shown aligns with the service area listed.
However, it should not be assumed that no routes are advertised for an endpoint set where ER is No. You may notice some duplication in IP Address ranges where there are different ports listed.
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