iSCSI CHAP password in QNAP storages
In QNAP storages you cannot change or reset password for iSCSI target using web interface. You can only delete target and create it again. Of course you will lose all data from target.
Fortunately, password stored in plain text in /etc/config/iscsi_trgt.conf file, field CHAPPasswd. There is field for CHAP user also. You can connect to the device using Putty and find password without need to reset the whole target.