# ERROR: unexpected error - lost ssh-agent **URL:** \ **Category:** Bug Reports\ **Created:** [September 7, 2021, 1:49pm UTC](https://discuss.dvc.org/t/error-unexpected-error-lost-ssh-agent/880 "2021-09-07T13:49:58Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![chamroukhi](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@chamroukhi](https://discuss.dvc.org/u/chamroukhi)\ **Post date:** [September 7, 2021, 1:49pm UTC](https://discuss.dvc.org/t/error-unexpected-error-lost-ssh-agent/880/1 "2021-09-07T13:49:58Z")
Hi, I’m trying to clean dvc cache with this command` dvc gc -a` to keep cached data referenced in all Git branches, as well as in the workspace (implying `-w` ) but i got this error: ```auto ERROR: unexpected error - lost ssh-agent ``` thanks for advance ---
**Author:** ![daavoo](https://avatars.discourse-cdn.com/v4/letter/d/b4bc9f/32.png) [@daavoo](https://discuss.dvc.org/u/daavoo)\ **Post date:** [September 7, 2021, 2:00pm UTC](https://discuss.dvc.org/t/error-unexpected-error-lost-ssh-agent/880/2 "2021-09-07T14:00:22Z")
Hi @chamroukhi . Could you share the output of running `dvc gc -a -v` (Adding the `-v` option)? ---
**Author:** ![chamroukhi](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@chamroukhi](https://discuss.dvc.org/u/chamroukhi)\ **Post date:** [September 7, 2021, 2:04pm UTC](https://discuss.dvc.org/t/error-unexpected-error-lost-ssh-agent/880/3 "2021-09-07T14:04:00Z")
> [@daavoo](#): > > `dvc gc -a -v` ````auto 2021-09-07 14:01:59,619 WARNING: This will remove all cache except items used in the workspace and all git branches of the current repo. Are you sure you want to proceed? [y/n] y 2021-09-07 14:02:11,157 DEBUG: Preparing to download data from 'ssh://nchamroukhi@192.168.14.4/mnt/data/dcv_remote_storage/gifs_project' 2021-09-07 14:02:11,157 DEBUG: Preparing to collect status from ssh://nchamroukhi@192.168.14.4/mnt/data/dcv_remote_storage/gifs_project 2021-09-07 14:02:11,158 DEBUG: Collecting information from local cache... 2021-09-07 14:02:11,158 DEBUG: Collecting information from remote cache... 2021-09-07 14:02:11,159 DEBUG: Matched '0' indexed hashes 2021-09-07 14:02:11,161 DEBUG: Establishing ssh connection with '192.168.14.4' through port '22' as user 'nchamroukhi' 2021-09-07 14:02:11,270 ERROR: unexpected error - lost ssh-agent ------------------------------------------------------------ Traceback (most recent call last): File "dvc/output.py", line 796, in get_dir_cache File "dvc/objects/ __init__.py", line 35, in check File "dvc/objects/db/base.py", line 133, in check File "dvc/objects/file.py", line 51, in check File "dvc/objects/stage.py", line 56, in get_file_hash FileNotFoundError: [Errno 2] No such file or directory: '/root/workspace/shared_cache/gifs_project/3a/b5e7da41fa9686abd87b978373aec5.dir' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "dvc/main.py", line 55, in main File "dvc/command/base.py", line 50, in do_run File "dvc/command/gc.py", line 50, in run File "dvc/repo/ __init__.py", line 50, in wrapper File "dvc/repo/gc.py", line 62, in gc File "dvc/repo/ __init__.py", line 395, in used_cache File "dvc/stage/ __init__.py", line 630, in get_used_cache File "dvc/output.py", line 911, in get_used_cache File "dvc/output.py", line 836, in collect_used_dir_cache File "dvc/output.py", line 798, in get_dir_cache File "dvc/data_cloud.py", line 84, in pull File "dvc/remote/base.py", line 56, in wrapper File "dvc/remote/base.py", line 484, in pull File "dvc/remote/base.py", line 321, in _process File "dvc/remote/base.py", line 173, in _status File "dvc/remote/base.py", line 130, in hashes_exist File "dvc/objects/db/ssh.py", line 73, in hashes_exist File "concurrent/futures/_base.py", line 619, in result_iterator File "concurrent/futures/_base.py", line 444, in result File "concurrent/futures/_base.py", line 389, in __get_result File "concurrent/futures/thread.py", line 57, in run File "dvc/objects/db/ssh.py", line 64, in exists_with_progress File "dvc/objects/db/ssh.py", line 31, in batch_exists File "contextlib.py", line 113, in __enter__ File "dvc/fs/pool.py", line 11, in get_connection File "dvc/fs/pool.py", line 53, in get_connection File "dvc/fs/ssh/connection.py", line 59, in __init__ File "paramiko/client.py", line 435, in connect File "paramiko/client.py", line 691, in _auth File "paramiko/agent.py", line 379, in __init__ File "paramiko/agent.py", line 65, in _connect File "paramiko/agent.py", line 83, in _send_message File "paramiko/agent.py", line 91, in _read_all paramiko.ssh_exception.SSHException: lost ssh-agent ------------------------------------------------------------ 2021-09-07 14:02:12,222 DEBUG: Version info for developers: DVC version: 2.3.0 (deb) --------------------------------- Platform: Python 3.8.10 on Linux-5.11.0-27-generic-x86_64-with-glibc2.7 Supports: All remotes Cache types: symlink Cache directory: ext4 on /dev/nvme0n1p2 Caches: local Remotes: ssh, ssh, ssh Workspace directory: ext4 on /dev/nvme0n1p2 Repo: dvc, git Having any troubles? Hit us up at https://dvc.org/support, we are always happy to help! 2021-09-07 14:02:12,223 DEBUG: Analytics is enabled. 2021-09-07 14:02:12,303 DEBUG: Trying to spawn '['daemon', '-q', 'analytics', '/tmp/tmpi805iiq5']' 2021-09-07 14:02:12,306 DEBUG: Spawned '['daemon', '-q', 'analytics', '/tmp/tmpi805iiq5']'``` ````