Someone could say me, what is the cause of the error?
Palo Alto: Monitor -> System
Receive Time: 08/09 9:22:58
Description, GlobalProtect Portal user authentication failed. Login from 89.140.19x.2, User name: EERR, Reason: Authentication failed: Invalid username or password.
Receive Time: 08/09 9:22:53
Description User 'CU4TREC4S4S \ EERR' failed authentication. Reason: Invalid username / password From 89.140.19x.2.
I wonder if it is an attack or not?
Is it an error about VPN client application?
GP portal uses Port 443 by default .For allowing uninterrupted access to GlobalProtect IP address, configured on Public Interface, port 443 needs to be allowed at all times.
If you see these messages more frequently from unknown/random usernames , you may consider blocking port 443 using security rule and changing the GP Portal port to a non-default port.
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