Symptom
When we do any small change under Device configuration (Devices > Device Management > Edit button) on both the FTD HA setup, while saving the config it throws an error "Virtual router [Global] - IPv4 Static route validation failed. Gateway not supported on leaked routes. Remove gateway for route with destination network [any-ipv4] through interface x Please configure a different route".
Same errors are being shown for a lot of other routes and its happening 2 HA pairs.
There are new static routes to be configured which are not being able to be add, as the time we add the route and click on 'Save', FMC throws those errors while validating the config.
Conditions
FMC and devices' version is 6.6.1
Workaround
The below workaround worked for the customer to resolve the issue:
1. Edit all the static routes which has interface x and change interface from interface x to y ( interface y was chosen since there are no Static routes defined on this interface ) .
2. Now re-edit all Static routes which have interface y and change interface from y -> x
3. Save the configuration .
