Errors when connecting to Colab KataGo via Lizzie

[foolai]

KataGo and SSH server on Colab server run fine.
However, when connecting Colab KataGo via Lizzie, I get an error.
I searched the internet and couldn't find a solution. Please help me.

(1) Lizzie Engine 0 -> C:/katagocolab/colab-katago.exe testuser 87651234

(2) Two error messages appearing in the gtp console window

case 1

1 name
2 version
3 boardsize 19
4 komi 6.5
2021/01/30 10:11:37 INFO using user name: testuser password: 87651234
2021/01/30 10:11:38 ssh options
{"host": "0.tcp.ngrok.io", "port": 16308, "user": "root"}
2021/01/30 10:11:38 failed to create ssh clientssh: handshake failed: read tcp 122.147.186.214:49253->3.17.7.232:16308: wsarecv: An existing connection was forcibly closed by the remote host.

case 2

1 name
2 version
3 boardsize 19
4 komi 6.5
2021/01/30 10:28:08 INFO using user name: testuser password: 87651234
2021/01/30 10:28:09 ssh options
{"host": "0.tcp.ngrok.io", "port": 16308, "user": "root"}
2021/01/30 10:28:09 failed to create ssh clientssh: handshake failed: EOF

[hope366]

I've seen similar errors.
I don't know the exact solution, but after a while I tried again and it worked fine.
I feel like the ssh connection itself has some instability.

[foolai]

I've seen similar errors.
I don't know the exact solution, but after a while I tried again and it worked fine.
I feel like the ssh connection itself has some instability.

hope366~ Thank you for your reply. But I always get the same error. It's a serious problem.
P.S : I used it for 4 months without any problems. However, an error occurs from yesterday.