ABAQUS/CAE maintains a secure connection to the network ODB connector by generating a key that is passed back and forth between the server and the client. If a file called .abaqus_net_passwd is present in your home directory on the remote server, ABAQUS/CAE uses the password in the file for authentication instead of the key generated by ABAQUS/CAE. ABAQUS/CAE checks that you are the only user with permission to read and write to the password file. In addition, you must update the file after 30 days, and the password must be at least eight characters long. ABAQUS uses password files to authenticate the connection between the client and the server if you start the network ODB server manually. These files are described in “Execution procedure for network output database file connector,” Section 3.2.18 of the ABAQUS Analysis User's Manual.