We have written a script deployed on Azure function which performs some operation on data stored in file server and stores the processed data back to file server. This script was working fine for last 1 month but now suddenly we have encountered below logon error: 2025-05-22T16:58:28.303Z] Initialising connection, guid: 352310-3c3-4b06-ad7-3f33ecfc, require_signing: True, server_name: 10...*, port: 445 2025-05-22T16:58:28.305Z] Setting up transp connection 2025-05-22T16:58:28.306Z] Connecting to DirectTcp socket 2025-05-22T16:58:28.3472] Starting negotiation with SMB server 2025-05-22T16:58:28.3482] Negotiating with SMB2 protocol with highest client dialect of: SMB_3_1_1 2025-05-22T16:58:28.3492] Sending SMB2 Negotiate message 2025-05-22T16:58:28.3817] Receiving SMB2 Negotiate response 2025-05-22T16:58:28.3822] Negotiated dialect: (785) SMB_3_1_1 2025-05-22T16:58:28.386Z] Connection require signing: True I 2025-05-22T16:58:28.388Z] Initialising session with username: agsgh**@***.com 2025-05-22T16:58:28.3902] 2025-05-22T16:58:28.3917] Sending SMB2 SESSION SETUP request message Receiving SMB2_SESSION_SETUP response message 2025-05-22T16:58:28.4232] More processing is required for SMB2 SESSION_SETUP 2025-05-22T16:58:28.427Z] Sending SMB2 SESSION SETUP request message 2025-05-22T16:58:28.428Z] Receiving SHB2_SESSION SETUP response message 2025-05-22T16:58:28.5262] Error while saving file to SMB --> Received unexpected status from the server: The attempted logon is invalid. This is either due to a bad username or authentication information . (3221225581) STATUS LOGON FAILURE: 0xc000006d Can it be due to firewall or network issue? It is already allowed on port 445. Should it be allowed for other ports too like 139,2049,443? I'm using smbprotocol library to connect to file server and below is my python code. Please help me to resolve this issue. json_string = data.replace('\n', '') fixeddata json.loads(json_string) FolderName = self.config.SHARED_FOLDER_PATH_FOR_OUTPUT SubFolderName = Fileid smb_base_path = f"\\\\10.*.*.*\\{FolderName}\\{SubFolderName}" smb_file_path=f"{smb_base_path}\\{contractnumber}.json" username "USER" password = "PSWD" if not smbclient.path.exists(smb_base_path, username=username, password=password): logging.info(f"Folder {smb_base_path} does not exist. Creating it...") smbclient.makedirs(smb_base_path, username=username, password=password) logging.info(f"Folder {smb_base_path} verified or created successfully.") with smbclient.open_file(smb_file_path, mode="w", username=username, password=password) as file: json.dump(fixeddata, file) logging.info(f"File saved to {smb_base_path}") Continue reading...
