I've been trying for almost two months to find out why my Android devices got slower and slower on the internet until the point they didn't really connect at all.
I've used my new Samsung Tab S2, Galaxy S5, and even pulled out an OLD Motorola Xoom to prove it wasn't an Android update.
I've also tried a TZ170, TZ190 and a new TX300W. I've swapped out the external WiFi access points and switches as well.
I can try an Android then switch to a Windows notebook on the same WiFi. Android fails, Windows works.
If I swap a common WiFi router for the Sonicwall everything works.
Through Packet Capture of everything from/to a single external site I found that the Android packets were slightly larger than the Windows. And that the response from the external site was received by the Sonicwall but for the Androids it was dropped "Invalid TCP Options(#4)" rather than forwarded as it was for the Windows.
Additional: The original TZ170 had not been updated for a long time before the problem developed. Exede claims its not their problem because their modem reports back as everything in the green and that it only effects the Androids.
I can upload the captures (I have all four formats saved) if that will help.
How do I get the Androids to be able to use Exede internet through the Sonicwall again?
