Hi everyone
I’ve installed the new Security Center 12.2 to which I connect via the web interface (the snap-in doesn't work, and I don't know why).
I also reinstalled the new Network Agent on all clients, yet some of them are still uncontrollable. The console tells me that no Network Agent is installed and even repeating the installation, or even disabling the firewall, the result does not change.
What am I doing wrong?
The clients are all Windows 10 2004
+2
Hi
I’d recommend standard steps:
From one such host, run the klnagchk utility "C:\Program Files (x86)\Kaspersky Lab\NetworkAgent\klnagchk.exe" to see what might be the problem when connecting to KSC:
You can share the printscreens here 
Cheers,
Milan
Hi
I’d recommend standard steps:
Yes and yes
I leaved the dafault values during NA installation
From one such host, run the klnagchk utility "C:\Program Files (x86)\Kaspersky Lab\NetworkAgent\klnagchk.exe" to see what might be the problem when connecting to KSC:
You can share the printscreens here
Printscreen translated from italian (in bold, the only error I’ve found):
-----------
Starting utility 'klnagchk' ...
Checking command line options ... OK
Basic library initialization ... OK
The current device is 'PCCLIENT.DOMAIN.local'
Network Agent version is '12 .2.0.4376 (12_2) '
Reading settings ... OK
Check your settings ... OK
Network Agent Settings:
Administration Server address: '192.168.1.11'
Use SSL: 1
Compress Traffic: 1
Number of Administration Server SSL ports: '13000'
Number of Administration Server ports: '14000'
Use proxy server: 0
Administration Server certificate: available
UDP port open: 1
Number of UDP ports: '15000'
Synchronization interval (min.): 15
Connection timeout (in seconds): 30
Send / Receive Timeout (in seconds): 180
Device ID: 3592288b-61a1-46a9-86c3-d355e6c8adec
Attempting to connect to the Administration Server ... Transport layer error connecting to http://192.168.1.11:13000: SSL authentication failed, certificate invalid or out of date.
Attempt to send an ICMP packet to the Administration Server
Sending ICMP packet 192.168.1.11 [192.168.1.11] ... OK
Sent = 1, Received = 1
Attempting to connect to Network Agent ... OK
Network Agent is running.
Receiving Network Agent Statistics ... OK
Network Agent Statistics:
Total number of synchronization requests: 0
Number of completed sync requests: 0
Total number of synchronizations: 0
Number of synchronizations performed: 0
Date / time of the last sync request: 11/26/2020 10:31:27 GMT (11/26/2020 11:31:27)
Basic library deinitialization ... OK
-----------
From client, if I try to open both http or https sites (with both 13000 or 14000 port) it asks for a certificate. It never happened before and, in the same company, I have other 3 clients working perfectly and 3 clients with this problem. All clients have the same Windows version
+2
Hi
from what I can see, there is problem with KSC certificate, although it is available.. I’d recommend to manually set the connection for Network Agent on affected host using klmover utility (see https://support.kaspersky.com/KSC/SP3/en-US/3911.htm).
Current KSC certificate is available in C:\ProgramData\KasperskyLab\adminkit\1093\cert folder.
Let us know if it helped 
Bye,
Milan
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