Suspicious connection

[Enquiries]

Good afternoon. I just got a notification from my router's software that a suspicious connection was detected and blocked on my Synology NAS. Any suggestions on what to do next? I've almost got a set it and forget it attitude for my NAS. I'm going in now and changing the password for the "admin" account for sure and maybe all the others, all 3. Then I'll look around on the NAS where it shows logins or attempted logins, see if there's anything unusual.

Thanks for aby help.