I am running a Sonicwall NSA 3500 with secondary HA configured on port X5. Everything was running fine until about 3 weeks ago when we started having massive slowdown on internet sites. I checked with our T1 provider but everything is running fine on their end. What's really weird is not only is the internet slow but navigating on the Sonicwall OS itself is very slow. It will take several seconds to go from page to page where before this problem it was almost instant. I'm accessing it from a local address so I fear something is wrong.
A few other notes:
1) We have a separate load balancer. However this is BEFORE the Sonicwall and it doesn't seem to be having any trouble.
2) We have many VPN tunnels - About 47. (It's the backbone of our business.) From what I've read this unit should easily be able to handle this but could they somehow be contributing to this problem? I first noticed the slowdown when I added our latest tunnel but I assumed it was a coincidence.
3) We also use this Sonicwall for DHCP and Content filtering. Again, there hasn't been a problem up until now.
Before I try to deal with Dell support I thought I'd try here. I can't seem to find any reason for the slowdown on the Sonicwall OS and the internet speed in general. All diagnostics I can think of pass without issue. Any help is appreciated.