Known Limitations
Learn about known limitations in this release for SRX Series devices.
For the most complete and latest information about known Junos OS defects, use the Juniper Networks online Junos Problem Report Search application.
Chassis Clustering
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In Z-mode configuration, sometimes the statistics of back-up session may not be correct on fail-over from primary to back-up.PR1667098
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On SRX4100 and SRX4200 devices, due to hardware limitation of Intel 82599 NIC where maximum of 128 unit case mac addresses plus mac filters are supported. For MNHA switching mode, if you define more than 127 virtual MACs on same revenue or aggregated Ethernet interface, the extra (those beyond 127) virtual MAC filters could not be programmed to the NIC so you would see traffics toward those vMACs got silently dropped.PR1687262
Infrastructure
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When upgrading from releases before Junos OS Release 21.2 to Release 21.2 and onward, validation and upgrade might fail. The upgrading requires using of 'no-validate' configuration statement. https://kb.juniper.net/TSB18251PR1568757
User Interface and Configuration
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On all Junos and Junos Evolved platforms configured with persist-group-inheritance, which is enabled by default from 19.4R3 onwards, might lead to mustd process crash in highly scaled configuration.PR1638847
VPNs
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In some scenario(e.g configuring firewall filter) sometimes SRX5000 line of devices might show obsolete IPsec SA and NHTB entry even when the peer tear down the tunnel. PR1432925