I just got this email about my server...

"Dear Sir/Madam,

We recently found this in our logs. It appears that one of your
users or systems has been trying to access parts of our net.

The logs are in +0100, and the time on the logging servers are
updated constantly against a stratum-2 server, and should be fairly
accurate.

TCP -> Nov 10 20:25:51 myip 35722 hisip 443 1
TCP -> Nov 10 20:25:53 myip 35692 hisip 443 1"


It goes on and on about every 7 seconds according to the rest of the email. What can I do?