SSH QEMU ISSUE by using with MacOs
Description of problem:
ssh connection between Qemu Image and Guest Host (MacOS) broken down after few minutes
Steps to reproduce:
1. Take the Qemu window and external ssh connection to backround, \
   wait until few minutes and the connection are frozen. \
   If we clicking to qemu window again, the ssh connection are available
Additional information:
The ssh connection settings by Macos: \
Host * \
AddKeysToAgent yes \
IdentityFile ~/.ssh/id_rsa \
IdentitiesOnly yes \
ServerAliveInterval 3600 \
TCPKeepAlive yes \
ServerAliveCountMax 2 \
\
\
SSH connection settings by Ubuntu Server:

Include /etc/ssh/sshd_config.d/*.conf \
\
#Port 22 \
#AddressFamily any \
#ListenAddress 0.0.0.0 \
#ListenAddress :: \
#HostKey /etc/ssh/ssh_host_rsa_key \
#HostKey /etc/ssh/ssh_host_ecdsa_key \
#HostKey /etc/ssh/ssh_host_ed25519_key \
#RekeyLimit default none \
#SyslogFacility AUTH \
#LogLevel INFO \
#LoginGraceTime 2m \
#PermitRootLogin prohibit-password \
#StrictModes yes \
#MaxAuthTries 6 \
#MaxSessions 10 \
#PubkeyAuthentication yes \
#Expect .ssh/authorized_keys2 to be disregarded by default in future. \
#AuthorizedKeysFile	.ssh/authorized_keys .ssh/authorized_keys2 \
#AuthorizedPrincipalsFile none \
#AuthorizedKeysCommand none \
#AuthorizedKeysCommandUser nobody \
#HostbasedAuthentication no \
#IgnoreUserKnownHosts no \
#IgnoreRhosts yes \
#PasswordAuthentication yes \
#PermitEmptyPasswords no \
ChallengeResponseAuthentication no \
#KerberosAuthentication no \
#KerberosOrLocalPasswd yes \
#KerberosTicketCleanup yes \
#KerberosGetAFSToken no \
#GSSAPIAuthentication no \
#GSSAPICleanupCredentials yes \
#GSSAPIStrictAcceptorCheck yes \
#GSSAPIKeyExchange no \
UsePAM yes \
#AllowAgentForwarding yes \
#AllowTcpForwarding yes \
#GatewayPorts no \
X11Forwarding yes \
#X11DisplayOffset 10 \
#X11UseLocalhost yes \
#PermitTTY yes \
PrintMotd no \
#PrintLastLog yes \
#TCPKeepAlive yes \
#PermitUserEnvironment no \
#Compression delayed \
#ClientAliveInterval 0 \
#ClientAliveCountMax 3 \
#UseDNS no \
#PidFile /var/run/sshd.pid \
#MaxStartups 10:30:100 \
#PermitTunnel no \
#ChrootDirectory none \
#VersionAddendum none \
#Banner none \
AcceptEnv LANG LC_* \
PasswordAuthentication yes \
ClientAliveInterval 600 \
TCPKeepAlive yes \
ClientAliveCountMax 10 \