I hit this error while execute 'swift list'.
Error: Account GET failed ... 503 Internal Server Error (first 60 chars of response)...
On swift storage node, check log '/var/log/swift/account-server.log', and get a piece of error message:[Errno 13] Permission denied '/srv/node/sdb1/accounts'
According to the error message, I found the root cause is that, on swift storage node, the swift user doesn't have permission on directory '/srv/node/'. Grant permission with CMD: chown -R swift:swift /srv/node
And the problem is solved. Hope this helpful.