<!-- Thanks for specifying a new feature! --> **Has this feature been discussed and generally agreed?** Kind of. See headline **Describe the solution you'd like** The user should be able to enable/disable the newly introduced IPv6 support by @softins via GUI in server and client. **Describe alternatives that have been considered** Only use the cli arguments. That's not very GUI user friendly Note: this issue has been opened for r 3.8.1