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RV320 specific websites timeout behind device

I have been using an RV320 Gigabit Dual WAN VPN Router for several years now in a simple modem->router->switch configuration, and around the start of August I began noticing a few websites began timing out when I tried to access them.


For example, I cannot reach (a dedicated server host) via HTTP any longer, though I was accessing it regularly before. It responds to ICMP traffic (ping, mtr/traceroute), and using nslookup I can verify DNS is responding properly.


# ping
PING ( 56(84) bytes of data.
64 bytes from ( icmp_seq=1 ttl=56 time=147 ms
64 bytes from ( icmp_seq=2 ttl=56 time=82.8 ms
64 bytes from ( icmp_seq=3 ttl=56 time=82.8 ms
64 bytes from ( icmp_seq=4 ttl=56 time=83.3 ms
64 bytes from ( icmp_seq=5 ttl=56 time=78.0 ms
--- ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4002ms
rtt min/avg/max/mdev = 78.071/94.909/147.450/26.340 ms

Testing a telnet connection to port 80

# telnet 80
Connected to
Escape character is '^]'.
Connection closed by foreign host.

# telnet 80


Additionally, when I bypass the RV320 and connect directly to the modem I'm able to connect and load sites properly. I have also upgraded the firmware to the latest version, and have attempted both power cycling and a factory reset without success.


Has anyone run into something like this before? Or have any suggestions about how to debug further?


Thank you,