What can I do about this spam message on iPhone?

Hi, I get the following message appearing on my iPhone. I’d like to know why, if its dodgy or harmless, thanks in Advance: ics.mx30-livestream.com identity if server cannot be verified

[Edit: Clarified subject]

Are you streaming anything or trying to stream anything when you see this message? If you are playing a 'free' game, this could be an ad that gets displayed by these free games, and there  is something wrong with the certificate for the site it is trying to display. 

To be safe I would just choose Cancel from those options. Who really wants the ads anyway.

And an FYI about iOS security. 

There is no malware protection in Norton Mobile Security on an IOS device. See this article from howtogeek . com for an explanation of why it is not necessary.

https://www.howtogeek.com/352613/what%E2%80%99s-the-best-antivirus-for-iphone-none/