What is port scanning on my network?

[v-600]

I have an old laptop that is living out its days as a plex server. My current laptop's AV keeps blocking port scans from the old laptop. Is there any way to find out what on the old laptop is generating them?

Is this a networking question - happy to move it/have it moved if not.

 

[dave_the_nerd]

I'm pretty sure the plex server is scanning your network for DLNA servers, firewall halls to phone home to plex.tv, and so on.

Turn off the plex server service and see if the scans continue. If they do, well, you've got malware.

 

[mxnerd]

https://docs.microsoft.com/en-us/sysinternals/downloads/tcpview

https://www.nirsoft.net/utils/cports.html

Plex server use port TCP 32400

 

[v-600]

I didn't think it was plex as they're usually a set of 5 different ports around the 55000 range.

I'll have a look at the other links in a mo.

 

[sonitravel09]

You may want to use a software like CommView to analyze the traffic from/to your computer.