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Cannot access the WEB management interface
Please try to Ping to detect whether it is connected.
If the encoder's IP address cannot be connected, please check whether the network connection is normal, or network settings are correct (if necessary, please restore the device settings).
If the IP address of encoder can be connected, but cannot access the WEB interface, firstly check your browser's settings (such as a browser proxy settings); exclude browser issue, then make sure that the encoder is behind a firewall/ NAT device, if yes, please carry out normal port mapping on the firewall / NAT devices. Once all these problems excluded, still unable to access the encoder WEB interface, please try to restore the device to factory settings.
After all these done, the problem is still there, please contact the manufacturer or reseller.