not enough information. What type of device are you trying to access? NM module in ISR, 210x? what does the config of the connected port look like?
If this is truly a "wireless router" i.e. NM Module in an ISR, issue the following commands:
config wlan disable 1
config interface vlan ap-mananger 0
config interface vlan management 0
Then try to access the device again
HTH,
Steve
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