@inforaudio, a few questions:
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What is the IP address of the device that you want to connect to?
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Is that device listening to port 80? (I noticed on your last screenshot that you are trying to access it via browser)
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After connecting to the wifi router using the Wifimanager plugin, please exit the app and go to your Android Wifi settings. What do you see there? Do you see that you are connected without internet access?
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What is the IP address that you received? (You can see that IP under “About phone/tablet” -> Status -> IP Address