the first thing you should do is to check the blinking status of the green indicator LED blinking status. Usually, there are two kinds of blinking statuses:

1. THE green LED quickly blinks one time and repeats, which means the device has failed to

connect to the router.

2. THE green LED quickly blinks twice and repeats, which means the device has connected to the

router but fails to connect to the server.

After judging the problem, you can troubleshoot the problems accordingly with below

solutions.

8 Solutions to Failed to Connect to the Router

1. Wrong WiFi Name or PWD:

You may have entered the wrong WiFi name and password in the pairing process. Please make sure

you have entered them exactly and select remember password.

2. Weak WiFi Signal

Your device may be too far away from the router, which causes a weak WiFi signal. Please try

again with a strong WiFi signal.

3. Phone Unable to Connect to WiFi

Your router or phone may come across some error, which causes a connection failure. Please

make sure your phone can access the WiFi router and works normally. If your phone has

WiFi network in the Access Point but the device still fails to connect to the router, please refer

to the below solutions.

4. Too many devices connect to the APP

There might be too many devices connect to the APP which connects with the router, please turn off the devices or turn off the APP and try again

5. Too Many Connections to One Router

You may have too many devices connecting to one router. Please disconnect other devices

and try again.

6. Router Error

Router error. Please restart your router and try again.

7. MAC Address Prohibited

For some security reasons, your MAC address may be filtered and prohibited. Under such a

condition, you should remove it from the prohibited address list.

8. MAC Address Conflict

Close all other connected devices to this router and try again.

9. DHCP tenancy term problem

Prohibit DHCP or extending the DHCP tenancy term when DHCP is open.

10. Under the condition of disabled DHCP or open DHCP, you can extend the lease.

7 Solutions to Failed to Connect to Server

1. Unable to Visit Internet

If the whole outer network cannot be accessed, then use your phone or PC to visit the Internet. If

successful, try to connect your device again.

2.Bandwidth Occupied

You may have downloaded too many files at the same time, which occupied most of the

bandwidth, thus your device did not have enough bandwidth to connect to the server. If so,

please stop downloading and try again.

3.More than one router with the same name

You may have more than one router with the same name, and your device may have

connected to the non-networked one. In this case, you should reset your router name and

choose the networked one to connect. Then try to connect your device again.

4.More than one DHCP server under one network

There may be errors existing between router topology. In this case, please check the

connection way between routers, then try again.

5.ARP Attacked

If you have checked all the above and found them no problems, maybe some terminal of the local

area network you are locating has affected the ARP virus. We suggest you to manually bind

the gateway and MAC address, then try again.

6.Firewall Settings

You may have opened a firewall or some security software. In this case, please temporarily

close them and try to connect the device again.

7.DNS Server Inaccessible

After making all the above checks and finding them no problems, the possible problem should be

DNS error. Please manually change the DNS server address and try again.

If still facing any questions, pls contact us: sales@s4a-access.com at your convenient time!

Appreciate your support!

Three Types of Access Control

Three access control paradigms organize how people gain access: role-based access control (RBAC), discretionary access control (DAC), and mandatory access control (MAC).

Access Control Rules. An access control rule maps a domain, an object type, a life cycle state, and a participant to a set of permissions. An access control rule specifies the rights of a user, group, role, or organization to access objects of a specified type and state within a domain.

There are two types of access control: physical and logical. Physical access control limits access to campuses, buildings, rooms, and physical IT assets. Logical access control limits connections to computer networks, system files, and data.

Access control models have four flavors: Mandatory Access Control (MAC), Role Based Access Control (RBAC), Discretionary Access Control (DAC), and Rule Based Access Control (RBAC or RB-RBAC). Let's look at each of these and what they entail.

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Here are six tips for implementing access control systems successfully:

1. Implement a central repository with well-defined whitelisting policies. ...

2. Solve self-generated scripts. ...

3. Withdraw your departing employees' digital rights. ...

4. Adapt your access control. ...

5. Create consistent processes to whitelist new cloud applications.

Physical access control refers to the selective restriction of access to space. Examples of physical access control include fob controlled gates, RFID doors and password protected IT systems. It's important for access control measures to be able to adapt to changing access requirements.

Access control systems may also be used to control access into certain areas located within the interior of buildings. The purpose of an access control system is to provide quick, convenient access to those persons who are authorized, while at the same time, restricting access to unauthorized people.