I have tried all the solution I can find. Still can't connect.
I use VMware to build my VM. And I use putty to connect my VM. After a few days use, I can't use putty to connect to my VM. I have try a lot of test, but still can't find anything wrong. So I just make a second VM. However, just one day used, I can't connect to it anymore. The second VM I even didn't change any network setting.
information about my server:
Ubuntu Server version : 20.04LTS
network mode: bridge
netplan
network:
version: 2
renderer: networkd
ethernets:
ens33:
addresses: [10.xx.xx.xx/24]
gateway4: 10.xx.xx.xxx
nameservers:
addresses: [10.xx.xx.x, 10.xx.xx.xx] //these are my company's dns
dhcp4: no
What I have tried
1. Connection test (ping and putty)
- host can't ping VM.
- VM can't ping host.
- both VM,host can ping gateway.
- my colleague can ping my computer (host) and my VM. And they can use putty to use my VM.
- The most strange thing is I can use my colleague's VM by putty, and my colleague also can use my VM by putty.
By the way both VM and host's network are working fine.
2. ssh test
service ssh status
console : active(running)
grep Port /etc/ssh/sshd_config
console: Port 22
sudo lsof -i -n -P | LISTEN
console: both ipv4 and ipv6 are LISTEN
3. Close firewall
ufw status:
inactive
hosts.allow, hosts.deny:
all comment
iptables -nvL:
INPUT,FORWARD,OUTPUT all blank
4. auth.log
It seems nothing wrong in log.
I can only find things like these:
ubuntuserver sshd[1990]: Server listening on 0.0.0.0 port 22.
ubuntuserver ssgd[1990]: Server listening on :: port 22.
5. arp test
I have check arp in my host Windows cmd
None of them have a same MAC address
6. Change to NAT、host-only net mode
Try to change bridge mode back to NAT or host-only mode, and modify netplan to original version.
Not working, still can't connect.
7. Allow putty and vmware in host
nothing change.
I already be in a desperate situation.
I'm grateful for any direction for me to try. Thanks in advance.
Hope you guys don't mind about my poor English. I have really tried my best.
