@CarlosGuida I can't say anything about Utility, but Web-interface cares a lot for browser cache. https://community.tp-link.com/en/business/forum/topic/161894 - check this topic.

@Chanax TL-ER6120 has several IPSec tunnels and only R600VPN has a problem? It is not clear, why you do not give info about your 6120....

@RevM Maybe it is possible, but I do not know, how to do it :)

@alfredudu You either use Link Backup feature to have only 1 WAN enabled and 2nd WAN enabled only after 1st WAN is down, or you tick Enable Application Optimized Routing, so 1 APP works through 1...

@RevM I use not Putty, but Kitty with Scripting. It has Line delay for cisco-like switches. You can easily batch commands.

@mardu Yes, even TL-R470T+ has Link Backup feature. https://emulator.tp-link.com/TL-R470T+_UN_6.0-Emulator-180929/index.html