when i check my security logs on my windows 2008 web server, I see 42,000 entries, almost all of them hack attempts over the last few days. they occur every few seconds, relentlessly (see screenshot).
i'm trying to figure out what port they are using? For example, in this screenshot, the error details say "Source Port: 50191" but never tell me what destination port. I want to know what port they are hitting my server. I don't even want my server asking for credentials. I'd rather they just get stonewalled right out of the gate.
I know that I have RDP open on the server so that I can remote desktop in. Are these all coming through via RDP? Is someone literally going to an RDP login screen and using a bot to try thousands of combinations? Or are these hack attempts possibly using some other port? How can I tell?