OK thanks for the reply. It is true that I went from 384 to 386. I wanted to test my previous problems with PPPoE connection on versions 386... 384_19 has been working well for several weeks. I made an update 3 days ago and everything works there. So I'll try the factory settings ...This has been reported before. It's not specifically about the port change, but changing anything on that page generates the error. It seems the user accounts got corrupted when upgrading from 384 to 386. A factory reset and manual configure should sort it out.
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