I've worked with several, and all worked great.
But one time,in one Maxisys Pro, I've trouble to connect.
This is what I have done: Shutoff the Modem/router and remove all the network from Maxisys shut off Maxisys. Turn on Modem/router and wait to have internet and wifi. After that turn, on Maxisys and try to connect. It works with me and I can send and received email, print, etc.