Hello,
I try to add one of my PLC from the Gateways to the List view.
The Gateway is shown me as online, also i have other remote tools to verify the Internet connection is working.
I do the Network Scan and the Gateway shows up, i select it and click on "Add to Server".
Then I type in Username and password and click on confirm. There it shows me the "Unkown Error", see screenshot.
If I use the wrong credentials it gives me the error message for this.
Other Devices work fine it's just this one.
Greetings
Jannis

Problem Solved
The Problem was within the Usermanagment.
There should be 6 files for the Usermanagment in /var/opt/codesys/

.UserMgmtDB.csv

.UserMgmRightstDB.csv

.GroupDatabase.csv

.UserDatabase.csv_

.GroupDatabase.csv_

.UserDatabase.csv

The file .UserMgmtDB.csv was missing.
I moved the other files in a savefolder.

Full Step by step instructions

1. stop the runtime with

sudo /etc/init.d/codesyscontrol stop

1. rename the following files on the PI: (or save them and then delete them) in this directory: /var/opt/codesys/

.UserMgmtDB.csv

.UserMgmRightstDB.csv

.GroupDatabase.csv

.UserDatabase.csv_

.GroupDatabase.csv_

.UserDatabase.csv

1. then restart the Runtime:

sudo /etc/init.d/codesyscontrol start

1. now reconnect the PLC via the Automation Server - here you will be asked to create a new CODESYS user password,

The user management files deleted above are then created again (in /var/opt/codesys/ on the PI).