This article explains the scenario where the MIST SRX Admin configures the Sped Test BETA for SRX Branch Series Devices and notices that the Speed Test results are not showing as expected.

MIST SRX Admin configures the WAN Speed Test (BETA) on WAN Edge Template and also under the site as required.

However, notices that the Speed Test results are not showing on the Dashboard as expected.

It was also observed that the Speed Test results are showing on SRX-POE devices and not on NON-POE Devices.

SRX-POE:
Jun 6 04:02:17 running op script 'mist_speedtest.py'
Jun 6 04:02:17 opening op script '/var/db/scripts/op/mist_speedtest.py'
Jun 6 04:02:17 reading op script 'mist_speedtest.py'
Jun 6 04:02:18 key_buf --json arg_len 4
Jun 6 04:02:18 key_buf --no-pre-allocate arg_len 15
Jun 6 04:02:18 key_buf --secure arg_len 6
Jun 6 04:02:18 key_buf --source arg_len 6
Jun 6 04:03:35 op script execution successful for 'mist_speedtest.py' with return: 0
Jun 6 04:03:35 finished op script 'mist_speedtest.py'

SRX-NON-POE:
Jun 24 19:03:51.495 2026 FIREWALL1 mgd[45494]: UI_CFG_AUDIT_OTHER: User 'mist' set: [juniper-config groups mist-script system scripts op file mist_speedtest.py] 
Jun 24 19:03:51.501 2026 FIREWALL1 mgd[45494]: UI_CFG_AUDIT_SET: User 'mist' set: [juniper-config groups mist-script system scripts op file mist_speedtest.py checksum sha-256] "xx****aabbccdd****xx -- "xx****aabbccdd****xx"

It has been confirmed by the MIST Dev team that the Speed Test Feature is not supported on SRX Branch Series Devices (SRX-3xx)

Hence, we can disable the Speed Test config under the site WAN Config for SRX Branch Series Devices.

NOTE : As the Feature is not supported, we see the difference in behavior on POE and NON-POE Devices. Hence, disabling the Feature is recommended in this scenario.