Upgrade from a new Pi3 to a newer Pi4 caused error ssh: Could not resolve hostname

Question

I was using a Raspberry Pi3 successfully connecting from Win10 PC with hostname (ssh pi@hostname). Ping hostname worked also.

I took the Pi3 chip and placed it into a Pi4. IP address changed from 192.168.1.180 to 192.168.1.181. I can still connect with ssh [email protected] but I can no longer connect with ssh pi@hostname. Nor can I ping hostname (i.e., ''Could not resolve hostname'').

status/attempts so far:

• hostname command confirms it is known by ssh
• Verizon My Network display shows the hostname
• /etc/hostname and /etc/hosts both show hostname
• i've rebooted the raspberry, the pc and the router many times
• i've reinstalled os-lite a few times (deleting .ssh\know_hosts before each attempt)
• i've tried using sudo raspi-config
• i've tried changing the hostname to hostname2 and back
• i noticed .ssh\known_hosts now only has one line with 192.168.1.181 ecdsa-sha2-nistp256... (with Pi3 it had two lines with hostname on the 2nd line), so i duplicated the 192.168.1.181 key with a 2nd hostname line ... no dice

Frustrating since it worked perfectly with Pi3.

Answer 1

Clear the name cache in Windows.

Open an command line windows as an administrator and issue:

ipconfig /flushdns

If that does not work try:

nbtstat –R

Make sure that all entries for the machine name AND IP address (IPv4 and IPv6) are removed from the known_hosts file on the Windows PC.

You can also try arp -d * if the first two do not work.