Stun server failing when AAAA record exists yet no IPv6 Configured, doesn't fallback to V4 Correctly

Hello,

We have configured a stun server for tr69 management from R2xx series, running latest firmware  4.3.4-R8(201712131041), fail to connect from behind NAT. The logs show that the stun server couldn't be contacted address family not supported. The WAN has a V4 but not a V6 assignment but it seems to be defaulting to the V6 DNS resolution and not falling back to V4.

<Tue Jan 30 16:53:26 2018> tr069[18038]: Connect to STUN server failed: Address family not supported...
<Tue Jan 30 16:53:36 2018> tr069[18038]: Connect to STUN server failed: Address family not supported...
<Tue Jan 30 16:53:46 2018> tr069[18038]: Connect to STUN server failed: Address family not supported...
<Tue Jan 30 16:53:57 2018> tr069[18038]: Connect to STUN server failed: Address family not supported...