Detection Of Unauthorized Access And Actions - Mitsubishi Electric Q03UDVCPU User Manual

10.4

Detection of Unauthorized Access and Actions

When the remote password mismatch count reaches the upper limit in unlock processing, "REMOTE PASS FAIL"
(error code: 2700) is detected.
If this occurs, unauthorized access from the outside of the system can be considered as a cause of the error.
Take the following actions as needed.
1.
Monitor the Remote password count (SD979 to SD999) and identify the connection of which
remote mismatch count has reached the upper limit in unlock processing.
2.
Stop the communication by disabling the connection as shown below.
• Select the connection in the "Ethernet diagnostics" window, and force it to be deactivated.
( GX Works2 Version 1 Operating Manual (Common))
[Diagnostics]
• Turn on the force deactivation flag of the connection in the special register (SD1276, SD1277).
3.
Clear the "REMOTE PASS FAIL" error (error code: 2700).
The remote password count (SD979 to SD999) is also cleared.
4.
Inform your system administrator that the number of unlock processing failures exceeded the
limit, and take appropriate actions.
If the error is detected due to frequent incorrect typing by authorized users, prevent this by the following operations.
• Enable "Clear Mismatch Count when Remote Password Matches" in the "Remote Password Detail Setting"
window.
• Clear the accumulated count of remote password mismatches using the special relay (SM1273).
[Ethernet Diagnostics] "Status of Each Connection"
CHAPTER 10 REMOTE PASSWORD
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