My personal opinion and rant:
Thankfully this isn't a production site because I've installed (and uninstalled) this software many, many times in various configurations (Portal, Datastore, just server, etc...). I've used the individual software executables and also used the Builder program and it seems that there is always a problem. I can only do what the software lets me do. At one point I thought I had Portal working (creating a Portal website, etc...) and I performed a simple Windows Server update and it killed the software, nothing worked. I've been using ESRI products for 30 years and have never seen this many problems. I think I prefer writing AMLs with old ArcInfo on a UNIX workstation.
Thanks this is a good question that I am sure others may have experienced this issue.
Lets take a look at the questions asked that I can answer for you:
Joining an ArcGIS Server to existing site failed | GeoNet, The Esri Community | GIS and Geospatial Professional Community
Please let me know if this helps you out.
Thanks for the quick response and answering my questions.
I do have local accounts (arcgis) set on both machines with the same password.
Also, for Question 5 about the Unable to Connect, this happened after I patched ArcGIS with their built in update software. Before I patched, I was able to get to manager (with the Create Site/Join existing site) but then I forgot that I had patched the software on ER-MARISS1 so I closed the browser and patched the software on ER-MARISS2. After that I couldn't connect. Confusing. I researched it for about 2 days before deciding to just reinstall.
One last note, when all this started I thought that maybe I needed Web Adaptor installed on ER-MARISS1 which I did, should I uninstall it or does it matter?
I just received your reply about the keycodes files. I checked and there is only one keycode file in that directory. I ran into that problem about two weeks ago and resolved that issue. I was trying to remember what I did but had forgotten, thanks for reminding me.
That brings up a question, should I remove that keycode file and reauthorize the software? Maybe on both servers?
Did you ever resolve this? I'm having the same issue. WinServer 2019 w/ArcGIS Server 10.8.1. The second server won't join the existing site and getting the "..../arcgis/admin' is not accessible" error
I'm responding to myself in case anyone else has the same issue. I resolved the problem by turning off the firewall within my private network. I imagine I can get it to work by configuring the firewall to allow the connection, but for now I'm going with shutting it down. I'll report back if I go that route
Good day Eric. I see that you had to turn off your firewall in order for this connection to be able to complete. Another option that you can look at is to allow the ports used by the ArcGIS Server to communicate with each other to be opened as found here:
I hope this helps and if not please let me know and we can see how elseI may assist with this.
I'm sorry but I'm just now seeing your post. I had surgery in August so everything work related was put on hold. I was never able to join the two machines together but I had another post and somebody wrote the following:
Craig touch on it where the first machine was set up using Enterprise Builder. The ArcServer on Machine one is a Hosted Server for the Data Store. You can not Join Machine 2 Arc Server to Machine 1 Arc Server because it is already a hosted server. The Arc Server on Machine 2 is an Image Server. You would not Join to an existing site but create a new one on machine 2. With that said you probably want to federate the machine 2 server to the Portal you have on machine 1. Once the Machine 2 server is all set up and working that is when you will federate the server to make it a part of the Portal.
I am currently installing Enterprise on just one machine for now and my little organization will go with that for now.