The security control of Bank of Nanjing cannot be installed for the following reasons:

1. The customer is using a non-IE core browser.

2. Please check whether there is a firewall or anti-virus software on the computer that blocks the installation and use of the password control.

3. The IE browser is not set as the default.

4. The security control is not downloaded from the official website.

5. The customer's network is abnormal or the computer is blocked.