Sorry, we're having a problem communicating with our servers

See this FAQ support.garmin.com/.../

Did all of the above, and I didn't downgrade the network since last use ... at work I have a 10 GBit public connection (I work for an ISP of sorts), and no outgoing firewalling. I even disabled IPv6 temporarily because it had given me grief for some services in the past. No difference.  There's certainly something rotten in the state of Garmin. ;/

Then follow the instruction at the bottom of the FAQ and call Garmin for detailed help. I've never seen that error in over 10 years of being a Garmin user and the FAQ normally resolves the issue.

I'm having the same issue. I started receiving messages around the time of the latest update. Is there a way to get an old version of Express from Garmin as a test without going to rogue web-sites?

If none of the steps in the FAQ resolve your issue follow the instruction at the bottom and contact Garmin 

I didn't see how to contact Garmin. Do you have an Email address or telephone number? The original guy in this thread had the issue on 2 different computers with 2 different OS types.

I've been having the same issue with my Windows 11 Pro laptop running 22H2. I initiated a chat session with Garmin Support and in the process, tried it on my Windows 10 Pro 22H2 workstation on the same network and it worked on that machine. At that point, I figured it is either a Windows 11 issue, or something in the Windows Firewall/security profile of the laptop, and told the Garmin chat support person that I'd see what I could do with the laptop to fix it on my own. Tried adding in firewall rules assigned to the Garmin Express executable and that didn't help (have since removed them after trying it). Both computers are using the same AV software and on the same LAN. I've since uninstalled from the laptop with Revo Uninstaller Pro, followed that with removing every entry with Garmin in it from the registry that showed up in a search of the registry, restarted the workstation, reinstalled, and still the same issue. I'm now wishing I had recorded the first day this had happened. At that time, I took the error message at face value as being an issue with Garmin's servers. Without knowing what other updates and installs may have occurred around the time of the failures beginning, I was wondering if it wasn't something to do with the CefSharp Browser that Garmin Express is now using after the retirement of Internet Explorer (located in my install at C:\program files (x86)\garmin\express\cefsharp.browsersubprocess.exe). Info on the browser over at: https://cefsharp.github.io/ Added a firewall rule for first outbound, then inbound, and that didn't help either. When I have some more time I'll try some packet captures. Hoping this is a Win11 compatibility issue and the next Garmin Express release will fix it, although I tried launching Express under Windows 8 compatibility, and that didn't help either. Hopefully, the steps I've listed that I've tried here will save someone else the time of trying them as well if they were considering the same troubleshooting ideas. Will post a reply here again if and when Express starts working on this machine again.

Thank you for your efforts. I was also thinking about doing a wireshark packet capture, when I get some time. However, I rarely have any issues with Garmin Express or download speeds when updating maps, so might not reveal all that much.

Thank you for the info Steven... I am using Express on a Windows 10 PC upgraded from Windows 8. I believe that you are right about cefsharp. At one point I received an error message stating something about blocking it and I said let it go. I wish I would of screen shot that error. I believe that's the issue too and I'm sure that the issue happened around the time of the latest Express update! At first it was an error that popped up after I synced but the sync went through. I ended up reloading Express and now I can't add any of my devices back. I disabled my firewall and rebooted but still had the same issue. Please let me know how you make out. Thanks again!