Anyone experienced problems with DoS prevention turned on (380.58) and port forward used?
My case:
AC87U, upgraded from 378.56_2 to 380.58 (380.57 had many issues to me). No reset after upgrade - just reboot. All work fine, for a first sight.
On the LAN side I have Synology NAS (FTP service up) and port forvarding config for it (21 and 5001 for web interface of NAS) on AC87U.
Access from WAN side to FTP and web interface of NAS, on 378.56_2 was without any issues. But, after upgrade to 380.58, I've experienced some kind of deny of access for those services (for example - can connect to FTP just one time in, probably, twenty tries). Nothing changed on the NAS side, and AC87U accessible from WAN, WebUI of AC87U show port forwarding is up and work.
So, when I tried to switch off a whole firewall on the AC87U - issue is gone! After that, I tried to switch firewall back on, and, just off a DoS prevention - no issue with forwarding!!! Tried to back DoS prevention on - issue is back. Now, I've turned DoS prevention off for a working port forward.
So, probably something changed here, in DoS prevention??? or here is some kind of interference with port forwarding feature????