Can't Publish to FS2020 or External Panel

If the program is running then http://localhost:8081/content/index2.html should product content.
The video you show is about clear the DNS cache, and other things about external web page access, but this is asking for a page on the "localhost" which is your computer thus quite irrelevant
I guess you tried a reboot
Does it work if firewall is turned OFF.

P.S. has nothing do with the router since its a program running on same PC.

Fyi, I tried creating flight plan again, I saw that some files did save in Documents folder in flight-plans folders but nothing is display on panels in FS2020, I'm having same problem as reference in this post simefb.freeforums.net/post/68/thread . When I click reload under "S", nothing happens. I still get "http://localhost:8081/content/index1.html" ERR_CONNECTION_REFUSED when trying to Publish External Panel> What is causing Chrome webpage to report "http://localhost:8081/content/index1.html" ERR_CONNECTION_REFUSED?

Sam, I finally got it installed and working properly.

Here is what I did.

1) I uninstalled the SimEFBmanager using the windows uninstall program. I then removed all traces of anything (folders and files) dealing with SimEFBmanager from my APPData folders. This included stuff from both Local and Roaming Folders. I also deleted all Local\TEMP files created in last 2 days.
2) I disconnected all peripherals accept a wireless USB mouse and keyboard and used only 1 monitor instead of three monitors. I also disconnected my Oculus Quest 2 connected via the USB Link cable.
3) I logged into my Windows PC using a local account instead of my Microsoft account
4) Prior to running the install. From the Microsoft Security settings, I shutdown Malware Bytes, Microsoft Virus and Threat Protection including (Real-time protection, Cloud-delivered protection, Automatic sample submission, and Tamper Protection). I also shutdown Firewall & network protections including (domain network and private network)
5) I moved the install program to the root C drive folder and ran the Command Prompt using administrator mode and ran this command line from the C:\ prompt. C:\simEFBinstall.msi

These steps were very similar to what I did to finally get my Oculus Link software installed on a different Windows 10 computer a couple of months ago as I spent over 2 months and probably 50 install attempts to get the "OculusSertup.exe" program to install on a pc so I could use my Oculus Quest 2 with the USB Link cable. T

For the Oculus install problem, multiple times, I had tried all the steps above except for number 2. Failure was always the same with the same data in the install log files. I traded several posts with Oculus support and they couldn't figure out the problem. Finally, I found an obscure Reddit post from someone who said they thought their Oculus install problem was resolved by disconnecting all peripherals accept for one monitor and just keyboard and mouse. I thought that sounded crazy and weird but I tried it and it worked.

The install log files during the Oculus installation indicated the install failed because of a folder access failure to AppData/Local folders. It seemed strange, simEFBmanager was seemingly denied access as well.

After getting simEFBmanager successfully installed and working by doing the all steps above, I was able reconnect all 3 monitors, reactivate Malware Bytes, Windows Firewall, etc and everything still works.

I think there maybe something goofy with Microsoft Net Framework that occurs during the installation that permanently causes some access problems to certain folders. Seems strange that extra monitors or peripherals connected or in combination with Microsoft account login vs local account could be the problem. Don't have the time or any more patience to try isolating the problem. I don't know the precise cause of the problem but I am now happy that it is working.

I wonder if my experience maybe similar to the problem in this post, simefb.freeforums.net/post/68/thread .

-James