`az network bastion tunnel` quietly drops connection

### Describe the bug

Having tunneled to an Azure instance, the `az network bastion tunnel` command drops the connection. Rather than raising an exception or reconnecting, it hangs. It is only possible to identify that there was a problem when debug mode is enabled. Without debug mode, the connection is dropped silently. The interval varies between a few minutes to several hours.

### Related command

```bash
az network bastion tunnel \
--debug \
--name \
--resource-group \
--resource-port 22 \
--port 2222 \
--target-resource-id "/subscriptions//resourceGroups//providers/Microsoft.Compute/virtualMachines/" \
2> az-network-bastion-tunnel.log
```

Contents of `az-network-bastion-tunnel.log` are shown below.

### Errors

No errors raised.

### Issue script & Debug output

Logs

```
DEBUG: cli.knack.cli: Command arguments: ['network', 'bastion', 'tunnel', '--debug', '--name', '', '--resource-group', '', '--resource-port', '22', '--port', '2222', '--target-resource-id', '/subscriptions//resourceGroups//providers/Microsoft.Compute/virtualMachines/']
DEBUG: cli.knack.cli: __init__ debug log:
Cannot enable color.
DEBUG: cli.knack.cli: Event: Cli.PreExecute []
DEBUG: cli.knack.cli: Event: CommandParser.OnGlobalArgumentsCreate [>, >, >]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableCreate []
DEBUG: cli.azure.cli.core: Modules found from index for 'network': ['azure.cli.command_modules.network', 'azure.cli.command_modules.privatedns', 'azext_bastion']
DEBUG: cli.azure.cli.core: Loading command modules:
DEBUG: cli.azure.cli.core: Name Load Time Groups Commands
DEBUG: cli.azure.cli.core: network 0.349 115 355
DEBUG: cli.azure.cli.core: privatedns 0.009 14 60
DEBUG: cli.azure.cli.core: Total (2) 0.358 129 415
DEBUG: cli.azure.cli.core: These extensions are not installed and will be skipped: ['azext_ai_examples', 'azext_next']
DEBUG: cli.azure.cli.core: Loading extensions:
DEBUG: cli.azure.cli.core: Name Load Time Groups Commands Directory
DEBUG: cli.azure.cli.core: bastion 0.004 2 9 /cliextensions/bastion
DEBUG: cli.azure.cli.core: Total (1) 0.004 2 9
DEBUG: cli.azure.cli.core: Loaded 129 groups, 424 commands.
DEBUG: cli.azure.cli.core: Found a match in the command table.
DEBUG: cli.azure.cli.core: Raw command : network bastion tunnel
DEBUG: cli.azure.cli.core: Command table: network bastion tunnel
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableTruncate [>]
DEBUG: cli.azure.cli.core.azlogging: metadata file logging enabled - writing logs to '/commands/2024-02-13.12-43-30.network_bastion_tunnel.51973.log'.
INFO: az_command_data_logger: command args: network bastion tunnel --debug --name {} --resource-group {} --resource-port {} --port {} --target-resource-id {}
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreArgumentLoad [.add_subscription_parameter at 0x>]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPostArgumentLoad []
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPostCommandTableCreate [.add_ids_arguments at 0x>, .add_cache_arguments at 0x>]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnCommandTableLoaded []
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreParseArgs []
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPostParseArgs [>, >, .parse_ids_arguments at 0x>]
INFO: az_command_data_logger: extension name: bastion
INFO: az_command_data_logger: extension version: 0.2.3
WARNING: Command group 'az network' is in preview and under development. Reference and support levels: https://aka.ms/CLI_refstatus
DEBUG: cli.azure.cli.core.auth.persistence: build_persistence: location='/msal_token_cache.json', encrypt=False
DEBUG: cli.azure.cli.core.auth.binary_cache: load: /msal_http_cache.bin
DEBUG: urllib3.util.retry: Converted retries value: 1 -> Retry(total=1, connect=None, read=None, redirect=None, status=None)
DEBUG: msal.authority: openid_config = {'token_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/token', 'token_endpoint_auth_methods_supported': ['client_secret_post', 'private_key_jwt', 'client_secret_basic'], 'jwks_uri': 'https://login.microsoftonline.com//discovery/v2.0/keys', 'response_modes_supported': ['query', 'fragment', 'form_post'], 'subject_types_supported': ['pairwise'], 'id_token_signing_alg_values_supported': ['RS256'], 'response_types_supported': ['code', 'id_token', 'code id_token', 'id_token token'], 'scopes_supported': ['openid', 'profile', 'email', 'offline_access'], 'issuer': 'https://login.microsoftonline.com//v2.0', 'request_uri_parameter_supported': False, 'userinfo_endpoint': 'https://graph.microsoft.com/oidc/userinfo', 'authorization_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/authorize', 'device_authorization_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/devicecode', 'http_logout_supported': True, 'frontchannel_logout_supported': True, 'end_session_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/logout', 'claims_supported': ['sub', 'iss', 'cloud_instance_name', 'cloud_instance_host_name', 'cloud_graph_host_name', 'msgraph_host', 'aud', 'exp', 'iat', 'auth_time', 'acr', 'nonce', 'preferred_username', 'name', 'tid', 'ver', 'at_hash', 'c_hash', 'email'], 'kerberos_endpoint': 'https://login.microsoftonline.com//kerberos', 'tenant_region_scope': 'NA', 'cloud_instance_name': 'microsoftonline.com', 'cloud_graph_host_name': 'graph.windows.net', 'msgraph_host': 'graph.microsoft.com', 'rbac_url': 'https://pas.windows.net'}
DEBUG: msal.application: Broker enabled? False
DEBUG: cli.azure.cli.core.auth.credential_adaptor: CredentialAdaptor.get_token: scopes=('https://management.core.windows.net//.default',), kwargs={}
DEBUG: cli.azure.cli.core.auth.msal_authentication: UserCredential.get_token: scopes=('https://management.core.windows.net//.default',), claims=None, kwargs={}
DEBUG: msal.application: Cache hit an AT
DEBUG: msal.telemetry: Generate or reuse correlation_id:
DEBUG: cli.azure.cli.core.sdk.policies: Request URL: 'https://management.azure.com/subscriptions//resourceGroups//providers/Microsoft.Network/bastionHosts/?api-version=2022-01-01'
DEBUG: cli.azure.cli.core.sdk.policies: Request method: 'GET'
DEBUG: cli.azure.cli.core.sdk.policies: Request headers:
DEBUG: cli.azure.cli.core.sdk.policies: 'Accept': 'application/json'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-client-request-id': ''
DEBUG: cli.azure.cli.core.sdk.policies: 'CommandName': 'network bastion tunnel'
DEBUG: cli.azure.cli.core.sdk.policies: 'ParameterSetName': '--debug --name --resource-group --resource-port --port --target-resource-id'
DEBUG: cli.azure.cli.core.sdk.policies: 'User-Agent': 'AZURECLI/2.57.0 (HOMEBREW) (AAZ) azsdk-python-core/1.28.0 Python/3.11.7 (macOS-14.3-arm64-arm-64bit)'
DEBUG: cli.azure.cli.core.sdk.policies: 'Authorization': '*****'
DEBUG: cli.azure.cli.core.sdk.policies: Request body:
DEBUG: cli.azure.cli.core.sdk.policies: This request has no body
DEBUG: urllib3.connectionpool: Starting new HTTPS connection (1): management.azure.com:443
DEBUG: urllib3.connectionpool: https://management.azure.com:443 "GET /subscriptions//resourceGroups//providers/Microsoft.Network/bastionHosts/?api-version=2022-01-01 HTTP/1.1" 200 1701
DEBUG: cli.azure.cli.core.sdk.policies: Response status: 200
DEBUG: cli.azure.cli.core.sdk.policies: Response headers:
DEBUG: cli.azure.cli.core.sdk.policies: 'Cache-Control': 'no-cache'
DEBUG: cli.azure.cli.core.sdk.policies: 'Pragma': 'no-cache'
DEBUG: cli.azure.cli.core.sdk.policies: 'Content-Length': '1701'
DEBUG: cli.azure.cli.core.sdk.policies: 'Content-Type': 'application/json; charset=utf-8'
DEBUG: cli.azure.cli.core.sdk.policies: 'Expires': '-1'
DEBUG: cli.azure.cli.core.sdk.policies: 'ETag': ''
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-request-id': ''
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-correlation-request-id': ''
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-arm-service-request-id': ''
DEBUG: cli.azure.cli.core.sdk.policies: 'Strict-Transport-Security': 'max-age=31536000; includeSubDomains'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-ratelimit-remaining-subscription-reads': '11999'
DEBUG: cli.azure.cli.core.sdk.policies: 'x-ms-routing-request-id': 'EASTUS2:20240213T174330Z:'
DEBUG: cli.azure.cli.core.sdk.policies: 'X-Content-Type-Options': 'nosniff'
DEBUG: cli.azure.cli.core.sdk.policies: 'X-Cache': 'CONFIG_NOCACHE'
DEBUG: cli.azure.cli.core.sdk.policies: 'X-MSEdge-Ref': 'Ref A: Ref B: Ref C: 2024-02-13T17:43:30Z'
DEBUG: cli.azure.cli.core.sdk.policies: 'Date': 'Tue, 13 Feb 2024 17:43:30 GMT'
DEBUG: cli.azure.cli.core.sdk.policies: Response content:
DEBUG: cli.azure.cli.core.sdk.policies: {
"name": "",
"id": "/subscriptions//resourceGroups//providers/Microsoft.Network/bastionHosts/",
"etag": "W/\"\"",
"type": "Microsoft.Network/bastionHosts",
"location": "eastus2",
"tags": {
"User": ""
},
"properties": {
"provisioningState": "Succeeded",
"dnsName": "bst-.bastion.azure.com",
"scaleUnits": 2,
"enableTunneling": true,
"enableIpConnect": false,
"disableCopyPaste": false,
"enableShareableLink": false,
"enableKerberos": false,
"ipConfigurations": [
{
"name": "IpConf",
"id": "/subscriptions//resourceGroups//providers/Microsoft.Network/bastionHosts//bastionHostIpConfigurations/IpConf",
"etag": "",
"type": "Microsoft.Network/bastionHosts/bastionHostIpConfigurations",
"properties": {
"provisioningState": "Succeeded",
"privateIPAllocationMethod": "Dynamic",
"publicIPAddress": {
"id": "/subscriptions//resourceGroups//providers/Microsoft.Network/publicIPAddresses/"
},
"subnet": {
"id": "/subscriptions//resourceGroups//providers/Microsoft.Network/virtualNetworks//subnets/AzureBastionSubnet"
}
}
}
]
},
"sku": {
"name": "Standard"
}
}
INFO: cli.azext_bastion.tunnel: Port 2222 is open
INFO: cli.azext_bastion.tunnel: Creating a socket on port: 2222
INFO: cli.azext_bastion.tunnel: Setting socket options
INFO: cli.azext_bastion.tunnel: Binding to socket on local address and port
INFO: cli.azext_bastion.tunnel: Finished initialization
WARNING: cli.azext_bastion.custom: Opening tunnel on port: 2222
WARNING: cli.azext_bastion.custom: Tunnel is ready, connect on port 2222
WARNING: cli.azext_bastion.custom: Ctrl + C to close
DEBUG: urllib3.util.retry: Converted retries value: 1 -> Retry(total=1, connect=None, read=None, redirect=None, status=None)
DEBUG: msal.authority: openid_config = {'token_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/token', 'token_endpoint_auth_methods_supported': ['client_secret_post', 'private_key_jwt', 'client_secret_basic'], 'jwks_uri': 'https://login.microsoftonline.com//discovery/v2.0/keys', 'response_modes_supported': ['query', 'fragment', 'form_post'], 'subject_types_supported': ['pairwise'], 'id_token_signing_alg_values_supported': ['RS256'], 'response_types_supported': ['code', 'id_token', 'code id_token', 'id_token token'], 'scopes_supported': ['openid', 'profile', 'email', 'offline_access'], 'issuer': 'https://login.microsoftonline.com//v2.0', 'request_uri_parameter_supported': False, 'userinfo_endpoint': 'https://graph.microsoft.com/oidc/userinfo', 'authorization_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/authorize', 'device_authorization_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/devicecode', 'http_logout_supported': True, 'frontchannel_logout_supported': True, 'end_session_endpoint': 'https://login.microsoftonline.com//oauth2/v2.0/logout', 'claims_supported': ['sub', 'iss', 'cloud_instance_name', 'cloud_instance_host_name', 'cloud_graph_host_name', 'msgraph_host', 'aud', 'exp', 'iat', 'auth_time', 'acr', 'nonce', 'preferred_username', 'name', 'tid', 'ver', 'at_hash', 'c_hash', 'email'], 'kerberos_endpoint': 'https://login.microsoftonline.com//kerberos', 'tenant_region_scope': 'NA', 'cloud_instance_name': 'microsoftonline.com', 'cloud_graph_host_name': 'graph.windows.net', 'msgraph_host': 'graph.microsoft.com', 'rbac_url': 'https://pas.windows.net'}
DEBUG: msal.application: Broker enabled? False
DEBUG: cli.azure.cli.core.auth.msal_authentication: UserCredential.get_token: scopes=('https://management.core.windows.net//.default',), claims=None, kwargs={}
DEBUG: msal.application: Cache hit an AT
DEBUG: msal.telemetry: Generate or reuse correlation_id:
DEBUG: cli.azext_bastion.tunnel: Content: {'resourceId': '/subscriptions//resourceGroups//providers/Microsoft.Compute/virtualMachines/', 'protocol': 'tcptunnel', 'workloadHostPort': '22', 'aztoken': '', 'token': None}
DEBUG: urllib3.connectionpool: Starting new HTTPS connection (1): bst-.bastion.azure.com:443
DEBUG: urllib3.connectionpool: https://bst-.bastion.azure.com:443 "POST /api/tokens HTTP/1.1" 200 None
INFO: cli.azext_bastion.tunnel: Websocket, connected status: True
INFO: cli.azext_bastion.tunnel: Got debugger connection... index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Both debugger and websocket threads started...
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 21, index: 1
INFO: cli.azext_bastion.tunnel: Successfully connected to local server..
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 1504, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 48, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 16, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 44, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 68, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 140, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1

<100k lines redacted all having the same pattern>

INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received websocket index: 1
INFO: cli.azext_bastion.tunnel: Sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to debugger, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for websocket data, connection status: True, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 80, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 100, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Received debugger data, nbytes: 84, index: 1
INFO: cli.azext_bastion.tunnel: Sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Done sending to websocket, index: 1
INFO: cli.azext_bastion.tunnel: Waiting for debugger data, index: 1
INFO: cli.azext_bastion.tunnel: Connection to remote host was lost.
INFO: cli.azext_bastion.tunnel: Client disconnected!, index: 1
INFO: cli.azext_bastion.tunnel: [Errno 9] Bad file descriptor
INFO: cli.azext_bastion.tunnel: Client disconnected 1
INFO: cli.azext_bastion.tunnel: Cleaning up session
DEBUG: urllib3.connectionpool: Starting new HTTPS connection (1): bst-.bastion.azure.com:443
DEBUG: urllib3.connectionpool: https://bst-.bastion.azure.com:443 "DELETE /api/tokens/ HTTP/1.1" 204 0
INFO: cli.azext_bastion.tunnel: Both debugger and websocket threads stopped...
INFO: cli.azext_bastion.tunnel: Stopped local server..

[hangs here]
```

### Expected behavior

The connection remains stable, the connection is re-established, or an error is raised if reconnection attempts fail.

### Environment Summary

```
azure-cli 2.57.0

core 2.57.0
telemetry 1.1.0

Extensions:
bastion 0.2.3
ssh 1.1.3

Dependencies:
msal 1.26.0
azure-mgmt-resource 23.1.0b2

Python location '/opt/homebrew/Cellar/azure-cli/2.57.0/libexec/bin/python'
Extensions directory '/Users/till/.azure/cliextensions'

Python (Darwin) 3.11.7 (main, Dec 4 2023, 18:10:11) [Clang 15.0.0 (clang-1500.1.0.2.5)]

Legal docs and information: aka.ms/AzureCliLegal

Your CLI is up-to-date.
```

### Additional context

Running on M1 MacBook Pro (2020), macOS 14.3 (23D56).