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I use RoyalTSX Its much better :)<br><br><a href="https://filedb.experts-exchange.com/incoming/2020/03_w12/1447360/Untitled.png" rel="ugc"><br><img src="https://filedb.experts-exchange.com/incoming/2020/03_w12/1447360/Untitled.png" class="fr-fic fr-dib"></a><br>&lt;/P&gt;
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Did you use the newest version (MS RDP Client 10)? Because it's very normal to use the port syntax you're using, and it just works. I even helped others only a few days ago. I suspect it's probably something else (firewall on the server?).
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I'm using that syntax right now with MS RDP Client 10. &nbsp;I also did it with MS RDP Client 8 in the past, but I don't know if updates to Windows 10 changed the protocol in some way.
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RDP over IPSEC can sometimes cause problems, I blogged about it years ago <a href="https://www.petenetlive.com/KB/Article/0000845" rel="ugc"><strong>here</strong></a>,<br><br>RoyalTSX is fantastic, I even paid for it (it was only about 25 euro) it has all my clients in there with all their servers/routers/switches/firewalls etc<br><br>It's a bit like mRemote but better and works on a Mac.<br>&lt;/P&gt;
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Thanks again, Pete Long. &nbsp;That's interesting about the MTU... that setting would've been WAY down on our list, and would not doubt have taken many hours to get to that point. &nbsp;Argh.
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Should the Microsoft RDP client for MacOS be able to make an RDP connection using a port other than 3389? &nbsp;We've tried the following syntax to no avail: &nbsp;i.e. 192.168.1.100:xxxxx &nbsp; The same address works just fine from a Windows 10 computer in the same location.
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Should the Microsoft RDP client for MacOS be able to make an RDP connection using a port other than 3389?  We've tried the following syntax to no avail:  i.e. 192.168.1.100:xxxxx   The same address works just fine from a Windows 10 computer in the same location.

RDP from Mac to Windows Server, non-standard port

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.