@advocatux It basically worked, with minor changes (in the address1 line, I had to put first the IP with the netmask, and then the gateway). Problem fixed! Thanks, again.

STARTLS as cipher, and START SESSION as authentication method. ( I'm traslating menus entries and options from Spanish, so I apologize again for any mistake). I think that's all I had to change.

I have just upgraded to OTA 5. Obviously, I have checked the option on the Morph browser settings. I tried too by unchecking it! Thanks in advance for any suggestion.