@DyJohnnY That was the point - the latter.

@DyJohnnY If using a common SSH client to access the router is your goal it is clearly stated: " SSH Services on the TP-Link products are only available for TP-Link apps. Other SSH clients cannot...

@mdsarif Basically changing the cable (Cat 5E/6) or the setting I posted can fix this issue. Go through this thread for troubleshooting.

@DyJohnnY See this FAQ.

@mdsarif Try this setting (it's the WAN port):

@Gekkouga That was my point - incompatibility issue. There's no much options to change in RE mode for troubleshooting. Previously the same WR840N probably was working in RE mode with other routers,...