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I have used this command to add a user (for testing purposes): 
PIX(config)# username admincity password nicecity 
 
Later on I have removed that username (admincity) by using the command below : 
PIX(config)# no username admincity 
Warning:Local user database is empty and there are still commands using 'LOCAL' for authentication. 
 
What cisco says : 
<a href="http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_command_reference_chapter09186a00801727a3.html" rel="ugc">http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_command_reference_chapter09186a00801727a3.html</a> 
[quote] 
Conversely, if the local database becomes empty when LOCAL is still present in the command, the following warning message appears: 
Warning:Local user database is empty and there are still commands using 'LOCAL' for authentication. 
[/quote] 
 
1- Did I delete all users, if there were any ? 
 
2- If I deleted them can I restore them ? 
 
3- What is the proper command to delete specific user ? Is it &quot;clear admincity&quot; ? 
 
Note: It is production device, i want to be sure that I am not going to screw up everything. 
 
Regards
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I have used this command to add a user (for testing purposes):
PIX(config)# username admincity password nicecity

Later on I have removed that username (admincity) by using the command below :
PIX(config)# no username admincity
Warning:Local user database is empty and there are still commands using 'LOCAL' for authentication.

What cisco says :
http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_command_reference_chapter09186a00801727a3.html
[quote]
Conversely, if the local database becomes empty when LOCAL is still present in the command, the following warning message appears:
Warning:Local user database is empty and there are still commands using 'LOCAL' for authentication.
[/quote]

1- Did I delete all users, if there were any ?

2- If I deleted them can I restore them ?

3- What is the proper command to delete specific user ? Is it "clear admincity" ?

Note: It is production device, i want to be sure that I am not going to screw up everything.

Regards

PIX add username and remove

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.

Software Firewalls

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

Cisco

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.