This error message may indicate that you have exceeded the maximum number of users on your Digitool system.
You are trying to access the RD but you get this message:
"System is inaccessible. Please contact your system administrator"
In the www_server_4881.log you can see errors like:
"Licensed users: 000000030
Active users : 000000031
"Error: License limit exceeded"
check how many web users can access the RD simultaneously with the command:
>cat $dtle_root/tab/license | grep WEB
If you need more users than you have please contact your Account Manager.
Please see also DigiTool - How to install a new license
Sometimes there are robots that access the server and occupy the license.
In this case, check your Apache definitions at $dtle_root/apache/conf/httpd.conf