I had the same issue. Somehow my 1820 had the manual ip address change to the same as another device in my network. I had the MAC address so I was able to find it using arp -a in a command prompt on a windows machine. Once I had the IP address, I could connect and change the bad setting in the network settings of the switch.
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trev rich
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Original Message:
Sent: Nov 09, 2019 07:22 AM
From: Martin Segelfeldt
Subject: Unable to access web interface for HP 1820-8G (J9979A)
I am unable to access the web interface to configure my 1820-8G switch. I tried to access it by going to 192.168.1.1 with only my pc connected to it.
I then tried reseting it, were unable to access it. Tried to access it with my iPad using a USB to ethernet adapter same result.
Connected the swtich to an other switch and i noticed it gets assigned 192.168.1.2, tried to access that page that did not work. I can however brows the internet with my pc connected to the switch.
PC => 1820-8G => other switch => router => ISP
I have power cycled the switch. And i am out of ideas on how i can access the network interface to make configurations.