SyncError("Fetching remote data failed (KeyError): (b'core',)") #1665

New Issue

MrUnknownDE · 2026-04-06T06:06:36+02:00

MrUnknownDE commented

2026-04-06 06:06:36 +02:00

Originally created by @TravAJohn on 7/9/2025

Deployment Type

Self-hosted

NetBox Version

v4.3.3

Python Version

3.11

Steps to Reproduce

Under Data Sources select sync
Review job status under jobs
Observe error output

Expected Behavior

The config template sync job should complete without an error

Observed Behavior

When I run sync on a Data Source I get the following error:
SyncError("Fetching remote data failed (KeyError): (b'core',)")

I also ran /opt/netbox/netbox/manage.py syncdatasource --all --traceback on the backend and this is the resulting stacktrace:

[1] Syncing netbox-config-templates... Traceback (most recent call last):
File "/opt/netbox/netbox/core/data_backends.py", line 118, in fetch
porcelain.clone(self.url, local_path.name, **clone_args)
File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/porcelain.py", line 581, in clone
(client, path) = get_transport_and_path(source, config=config, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/client.py", line 3023, in get_transport_and_path
return SSHGitClient(hostname, username=username, config=config, **kwargs), path
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/client.py", line 2146, in init
config_ssh_command = config.get((b"core",), b"sshCommand")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/config.py", line 342, in get
return self._values[(section[0],)][name]
~~~~~~~~~~~~^^^^^^^^^^^^^^^
File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/config.py", line 116, in getitem
return self._keyed[lower_key(item)]
~~~~~~~~~~~^^^^^^^^^^^^^^^^^
KeyError: (b'core',)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/netbox/netbox/manage.py", line 10, in
execute_from_command_line(sys.argv)
File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/init.py", line 442, in execute_from_command_line
utility.execute()
File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/init.py", line 436, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/base.py", line 416, in run_from_argv
self.execute(*args, **cmd_options)
File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/base.py", line 460, in execute
output = self.handle(*args, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/netbox/netbox/core/management/commands/syncdatasource.py", line 43, in handle
raise e
File "/opt/netbox/netbox/core/management/commands/syncdatasource.py", line 38, in handle
datasource.sync()
File "/opt/netbox/netbox/core/models/data.py", line 182, in sync
with backend.fetch() as local_path:
File "/usr/local/lib/python3.11/contextlib.py", line 137, in enter
return next(self.gen)
^^^^^^^^^^^^^^
File "/opt/netbox/netbox/core/data_backends.py", line 120, in fetch
raise SyncError(_("Fetching remote data failed ({name}): {error}").format(name=type(e).name, error=e))
core.exceptions.SyncError: Fetching remote data failed (KeyError): (b'core',)

This looks to be something related to the Dulwich plugin but I'm not 100% sure. I did also add a .gitconfig file to my netbox user's home dir with:
[core]
sshCommand = ssh

but this didn't change the observed behavior.

*Originally created by @TravAJohn on 7/9/2025* ### Deployment Type Self-hosted ### NetBox Version v4.3.3 ### Python Version 3.11 ### Steps to Reproduce 1. Under Data Sources select sync 2. Review job status under jobs 3. Observe error output ### Expected Behavior The config template sync job should complete without an error ### Observed Behavior When I run sync on a Data Source I get the following error: SyncError("Fetching remote data failed (KeyError): (b'core',)") I also ran /opt/netbox/netbox/manage.py syncdatasource --all --traceback on the backend and this is the resulting stacktrace: [1] Syncing netbox-config-templates... Traceback (most recent call last): File "/opt/netbox/netbox/core/data_backends.py", line 118, in fetch porcelain.clone(self.url, local_path.name, **clone_args) File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/porcelain.py", line 581, in clone (client, path) = get_transport_and_path(source, config=config, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/client.py", line 3023, in get_transport_and_path return SSHGitClient(hostname, username=username, config=config, **kwargs), path ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/client.py", line 2146, in __init__ config_ssh_command = config.get((b"core",), b"sshCommand") ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/config.py", line 342, in get return self._values[(section[0],)][name] ~~~~~~~~~~~~^^^^^^^^^^^^^^^ File "/opt/netbox/venv/lib/python3.11/site-packages/dulwich/config.py", line 116, in __getitem__ return self._keyed[lower_key(item)] ~~~~~~~~~~~^^^^^^^^^^^^^^^^^ KeyError: (b'core',) During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/opt/netbox/netbox/manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line utility.execute() File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/__init__.py", line 436, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/base.py", line 416, in run_from_argv self.execute(*args, **cmd_options) File "/opt/netbox/venv/lib/python3.11/site-packages/django/core/management/base.py", line 460, in execute output = self.handle(*args, **options) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/netbox/netbox/core/management/commands/syncdatasource.py", line 43, in handle raise e File "/opt/netbox/netbox/core/management/commands/syncdatasource.py", line 38, in handle datasource.sync() File "/opt/netbox/netbox/core/models/data.py", line 182, in sync with backend.fetch() as local_path: File "/usr/local/lib/python3.11/contextlib.py", line 137, in __enter__ return next(self.gen) ^^^^^^^^^^^^^^ File "/opt/netbox/netbox/core/data_backends.py", line 120, in fetch raise SyncError(_("Fetching remote data failed ({name}): {error}").format(name=type(e).__name__, error=e)) core.exceptions.SyncError: Fetching remote data failed (KeyError): (b'core',) This looks to be something related to the Dulwich plugin but I'm not 100% sure. I did also add a .gitconfig file to my netbox user's home dir with: [core] sshCommand = ssh but this didn't change the observed behavior.

MrUnknownDE closed this issue

2026-04-06 06:06:36 +02:00

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Branches Tags

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21455-sql-indexes-audit

21357-register-model-actions

feature

20924-plugin-ui-components

21766-improve-test-coverage-for-sortable-table-columns

21157-export-template-public-models

21025-pre-render-config-contexts

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9583-add_column_specific_search_field_to_tables

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Reference: github/netbox#1665