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By default, Skype will attempt to automatically detect your proxy settings. To specify the exact proxy settings that Skype will use, choose an alternative option from the dropdown menu, we would normally select SOCKS or HTTPS, for SOCKS we use the ports 1080 or 1085 or 1090, for HTTPS we use ports 465/995 and 7070. All proxies can be found here The Reverse proxy is a device that receives requests from clients on and then forwards the request on to another resource, in this case a Skype for Business Front End server. This is done in such a seamless manner that the Reverse Proxy is transparent to the client. This helps catch Apps that are not proxy aware or have broken proxy implementations. It also allows Apps like Skype to use native UDP, which is often the preferred transport (proxy-TCP is the fallback for environments that can't support UDP transport). Cheers, Scott- When you set a proxy auto-configuration (PAC) script file in Microsoft Lync Online client, the following issues occur: You cannot sign in Microsoft Lync Online server. Sometimes, you cannot search contacts in Microsoft Lync 2013 (Microsoft Skype for Business). For Skype to work correctly, the following ports need to be open in your firewall: 443/TCP; 3478-3481/UDP; 50000-60000/UDP; For the best possible call quality experience, these ports are needed too:


Skype for Business should use proxy server to sign in Microsoft Skype for Business 2015 (Lync 2013) first tries direct connection for the Session Initiation Protocol (SIP) traffic. After it gets time-out, the client will use the proxy server. This causes noticeable delays when you sign in the client. Proxy servers for Teams or Skype for Business Online

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Unfortunately, I can't get Skype to sign in unless I disable our proxy (currently hosted with Bluecoat). Bluecoat have informed me that it's the queer way Skype operates: "Skype is designed to be a peer to peer communication solution. As such, it can communicate over ports 80 and 443, but when it communicates over port 443, it doesn't Oct 14, 2016 · I had to install Skype for Business Online, Windows PowerShell Module on the Lync frontend server and allowing that frontend server to access internet bypassing proxy authentication. You will need to allow the Frontend server to access the Authentication ID server and Skype for Business Online related IP with bypassing Proxy authentication. Aug 08, 2016 · Skype for Business Edge & Reverse Proxy When discussing the Edge Server environment, we're referencing components that are, for the most part, deployed in a perimeter network (that's to say it's either in a workgroup or a domain that's outside your Skype for Business Server domain structure). Jan 17, 2018 · 7. Configure Skype Connection Settings. If you use a proxy server, configuring your Skype connection settings can reportedly make the ‘Skype can’t connect’ problem vanish. So, let’s give this method a try. To help your Skype app connect to your proxy server, do the following: Skype -> Tools -> Options -> Advanced -> Connection Apr 21, 2020 · Skype's underlying technology leverages a distributed peer-to-peer architecture to route multimedia packets among the users as opposed to centralized servers. The peer-to -peer network offers increased connectivity and scalability, and also provides firewall traversal and dynamic routing to evade corporate firewalls. The Skype Meetings App has been a step backwards for us unfortunately. It appears to attempt to access HTTPS resources directly, indicating that it may not be coded to respect the system web proxy configuration. Skype is not only VoIP, it's only a very good application for making voice and video calls. Using proxy in Skype is easy, you just need to configure it properly. Run Skype. Go to Tools → Options. Click Advanced and choose Connection. Choose HTTPS as a proxy type and place IP address to Host, port to Port. Click Save