You may isolate the issue as follows.
I assume you have SRX acting as gateway and EX 2300 are cascaded one by one to it.
1. Hence, to check the default gateway reach ability issue, you may plug your endpoint on SRX in the same vlan when they are connected on switch and use static ip to test.
See if you are getting the same issue on SRX as well.
1. a. - if you having the issue with default gateway ping with SRX as well then you need to check the SRX to troubleshoot further. Paste the configuration of SRX.
1.b - if you are facing the same issue of default gateway ping with static, ip then you may connect your endpoint with the switch immediately connected to SRX and check.
Similarly, you may go till the last switch at least to isolate the issue.
1.c. - if you are successful with switch 1 (immediately connected EX 2300) using static ip then try DHCP and see the results.
I believe this way, you are should be able isolate the issue.
Post which, do paste the configuration of the troublesome device to troubleshoot it further.
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