Cannot establish ssh connection

[Phil795]

For two days we can no longer access the server via SSH.

The connection is established, but unexpectedly interrupted.

I can't figure out where the problem is. Nothing has changed in the server settings.

```

debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /c/Users/Philipp/.ssh/id_philipp_openssh
Enter passphrase for key '/c/Users/Philipp/.ssh/id_philipp_openssh':
debug3: sign_and_send_pubkey: RSA SHA256:RkWv9t+PdZJ9QSS5o/6RYklGdllqMUrHe41LqbYlV50
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:RkWv9t+PdZJ9QSS5o/6RYklGdllqMUrHe41LqbYlV50
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to bitbucket.simplifysoft.de ([65.108.97.61]:7999).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x20
debug2: client_session2_setup: id 0
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 2097152 rmax 32768
debug3: receive packet: type 100
debug2: channel_input_status_confirm: type 100 id 0
shell request failed on channel 0

```