One last update and, to document it in case some else has a similar issue. I believe we found the root cause of the failure. We have a Layer 7 Firewall policy that denies all Peer-to-Peer (P2P) traffic. Apparently 14.53 deals differently with that policy than 15.42. After many tests with the Meraki engineer we removed that specific policy and SAP started to work correctly. He (Meraki engineer) was checking at his captures and he stopped seeing the reset happening after the policy was removed. They are investigating what is causing that issue.    Thank you all for your help. ... View more

Hello all, just wanted to give you an update on this matter. On Saturday we proceed, as recommended by Meraki Support, to upgrade the MX to 16.4. With new firmware we continued experiencing the same problem. We rolled back to 14.53 again. ... View more

Hello @John_R_Gudmann  and @Inderdeep    Thank you for your reply. John, if I understand correctly, in your case, SAP b1 worked after the second upgrade. Is that the case?   Yesterday, the the help of Meraki engineer, we upgraded the MX100 again to 15.42, it still did not work. After the engineer gathered some data for further review we had to roll back the upgrade. He suggested to try firmware 16.4 (I believe). We are going to try the upgrade tomorrow afternoon.   Thank you again for your posts... ... View more

Hello @Inderdeep I agree that it seems to be SAP crashing however, the first this we did during our troubleshooting was what you are mentioning. It did not fix the problem. We even reinstalled SAP client and did not work. the only thing was to roll back the firmware.   Thank you again. ... View more

Hello @CptnCrnch and @Inderdeep  here are the logs of the application working (first one) and the application not working (second one)     And here is the log for application NOT working.   I also ran the meraki packet capture tools I was not able to see much for two reasons: I'm not too handy analyzing packets and the traffic seems to be encrypted. I do see communication and traffic going back and forth between the server and the client but that was as far as I could get.   Thank you for your help!!! ... View more

Hello @Inderdeep , thank you very much for your post.   I did check the release notes, there isn't any reference to any issue with SAP.   Thank you ... View more