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Using the FortiGate 50G-DSL might have stability problems when operating on DSL circuits. Affected units exhibit intermittent loss of DSL connectivity. Once the connection drops, the device fails to automatically re-establish the link, requiring a manual reboot to restore service. In some cases the connection does not establish at all, even after a reboot.
This issue will be resolved in the following FortiOS firmware:
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7.4.10 (scheduled to be released in March 2026).
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7.6.5 (scheduled to be released in December 2025).
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8.0.0 (scheduled to be released in March 2026).
Note: These timelines for firmware release are estimated and may be subject to change.
This behavior can be confirmed by running:
diagnose debug application dsl -1
diagnose debug enable
In the output, if this issue occurs, the line highlighted in bold should be appearing multiple times:
xdsl_config_sync(201): Start sync, config_change=1
event_recv(105): EN7517 WAN Change:01
xdsl_config_sync(207): ret=0, intended to change dsl mode from [ITU G.993.5(G.Vectoring)] to [VDSL2]
event_recv(105): EN7517 WAN Change:40
event_recv(105): EN7517 WAN Change:01
event_recv(105): EN7517 WAN Change:40
event_recv(105): EN7517 WAN Change:01
event_recv(105): EN7517 WAN Change:80
xdsl_config_sync(201): Start sync, config_change=1
event_recv(105): EN7517 WAN Change:01
xdsl_config_sync(207): ret=0, intended to change dsl mode from [ITU G.993.5(G.Vectoring)] to [VDSL2]
The debug output above indicate the firmware's inability to stabilize the DSL mode.
In order to collect additional data for DSL troubleshooting, see the following article:
Troubleshooting Tip: Collecting Logs and Configuration for DSL Troubleshooting with TAC
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