This would make a basic brute-force attack time consuming, but might not rule out some kind of distributed attack (which is beyond my means of testing easily). After their 30 second ban, it appears they are limited to 2 attempts with a 60 second ban with consecutive attempts increasing the ban time (with two attempts each). If a user tries to connect during a ban you will see "CLoginServer.AuthenticateServer: still blocked" in the log. If someone uses all the retries, it bans that ID for 30 seconds. You will have to search up from that line to find the most recent instance of "client hello sent" which shows their TeamViewer ID. That line will also show the retries remaining (default seems to be 5). You can search for "Authentication failed" to find instances of someone attempting to connect and entering the wrong TeamViewer password. Since any successful connections are shown in Connections_incoming.txt, this is mainly useful to search for failed connections. There's a lot of crap mixed in here, so I am using search to jump to what we're looking for. This appears to rotate, so there's also a TeamViewer11_Logfile_OLD.log file as well, which is just older data. It's called TeamViewer11_Logfile.log (replace 11 with the version you are running if it's not 11).
The first is Connections_incoming.txt (if you have extensions hidden, it might not show the ".txt"). In Windows machines, they are both located here: There are two log files that you can check for connections. If you use this program at all, check your log files (From Reddit) They've just had a massive hack and many people are having passwords, credit card numbers and paypal accounts hijacked.
TeamViewer is a popular remote desktop software used in many corporations, computer repair and home computer solutions.
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