Normally, the ability to access the maintenance screen for an eContact allows the user to change the web password for that eContact. This change allows you to disable that ability at the Company level.
To disable the ability for users to change the web password, Go to Utilities / Global Setup / System / econtact Manager and set Field 14 to "N":
After you do this, no one will be able to change the eContact password:
Programs: NSCTLMN1, SYCONMNT