For all the E20 modules I use the default settings:
I disable the telnet for administration (uses port 23). Instead, I add a TCP server on port 23 which accepts a maximum of 5 simultaneous connections. For all those settings, I use a default template which can downloaded here:
I try to keep posting the lates firmware here:
Eport E20 specifications:
More information about the E20 ethernet modules can be find on the factory website.