However, looks like users who are testing this beta version experiencing difficulties due to some nasty bugs.
my iPad Mini 2 with 11.3 Public Beta can connect with my wifi online grid now.
But, I must to turn off my wifi password first on router parameters
Same issue here.
First any WiFi with encryption password does not work (WEP, WPA2).
According to reports, at least one user has been contacted by Apple for more information about the bug.
However, that person had already downgraded to iOS 11.2.5 to fix the problem.
Source:piunikaweb
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source: www.techworm.net