Thanks ckandu, but...
I did the next test:
* BMC.ASSET and BMC.ADDM are available for Demo user
* IP is correct 10.88.3.102 and Port 5020 (I can connect with Telnet)
* I can connect with Demo via user tool without problems
any other ideas?
The error you got was what ADDM received from CMDB. Your error message seems to be truncated, usually it has more information after "Appended Text: ip_address".
Is the same error reported in $TIDEWAY/log/tw_exporter_connection_test.log? Did you ping/telnet to CMDB from ADDM appliance?
Error 90 means the Remedy server either is not running or you have the wrong IP. Instead of working with telnet, get a Remedy usertool and make sure you can actually login using that port and the Demo credentials. If it works, then there is probably a firewall blocking access between ADDM and the CMDB.
I got this when I tried to access Atrim Core Console:
ARERR  A failure occurred because the name of the server "ip" is not in the list of valid mid tier servers.
This when I login using Remedy User Tool, the login to Remedy was sucessful.
The problem seems to be related with ARS server IP or hostname beyond being related to the user, check if AR Server IP is solved to its correct hostname and vice versa.