about email 2FA error：SMTP error: response error: error Tag at: #917

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MrUnknownDE · 2026-04-06T00:52:26+02:00

MrUnknownDE commented

2026-04-06 00:52:26 +02:00

Originally created by @CJSen on 9/25/2024

Vaultwarden Support String

Your environment (Generated via diagnostics page)

Vaultwarden version: v1.32.0-040e2a7b
Web-vault version: v2024.6.2c
OS/Arch: linux/x86_64
Running within a container: true (Base: Alpine)
Environment settings overridden: true
Uses a reverse proxy: true
IP Header check: true (X-Real-IP)
Internet access: false
Internet access via a proxy: false
DNS Check: true
Browser/Server Time Check: true
Server/NTP Time Check: n/a
Domain Configuration Check: false
HTTPS Check: false
Database type: SQLite
Database version: 3.46.1
Clients used:
Reverse proxy and version:
Other relevant information:

Config (Generated via diagnostics page)

Show Running Config

Environment settings which are overridden: SIGNUPS_ALLOWED, INVITATIONS_ALLOWED, SHOW_PASSWORD_HINT, ADMIN_TOKEN, SMTP_HOST, SMTP_SECURITY, SMTP_PORT, SMTP_FROM, SMTP_USERNAME, SMTP_PASSWORD

{
  "_duo_akey": null,
  "_enable_duo": true,
  "_enable_email_2fa": true,
  "_enable_smtp": false,
  "_enable_yubico": true,
  "_icon_service_csp": "",
  "_icon_service_url": "",
  "_ip_header_enabled": true,
  "_max_note_size": 10000,
  "_smtp_img_src": "cid:",
  "admin_ratelimit_max_burst": 3,
  "admin_ratelimit_seconds": 300,
  "admin_session_lifetime": 20,
  "admin_token": "***",
  "allowed_iframe_ancestors": "",
  "attachments_folder": "data/attachments",
  "auth_request_purge_schedule": "30 * * * * *",
  "authenticator_disable_time_drift": false,
  "data_folder": "data",
  "database_conn_init": "",
  "database_max_conns": 10,
  "database_timeout": 30,
  "database_url": "***************",
  "db_connection_retries": 15,
  "disable_2fa_remember": false,
  "disable_admin_token": false,
  "disable_icon_download": false,
  "domain": "****://*********",
  "domain_origin": "****://*********",
  "domain_path": "",
  "domain_set": true,
  "duo_context_purge_schedule": "30 * * * * *",
  "duo_host": null,
  "duo_ikey": null,
  "duo_skey": null,
  "duo_use_iframe": false,
  "email_2fa_auto_fallback": false,
  "email_2fa_enforce_on_verified_invite": false,
  "email_attempts_limit": 3,
  "email_change_allowed": true,
  "email_expiration_time": 600,
  "email_token_size": 6,
  "emergency_access_allowed": true,
  "emergency_notification_reminder_schedule": "0 3 * * * *",
  "emergency_request_timeout_schedule": "0 7 * * * *",
  "enable_db_wal": true,
  "enable_websocket": true,
  "enforce_single_org_with_reset_pw_policy": false,
  "event_cleanup_schedule": "0 10 0 * * *",
  "events_days_retain": null,
  "experimental_client_feature_flags": "fido2-vault-credentials",
  "extended_logging": true,
  "helo_name": null,
  "hibp_api_key": null,
  "http_request_block_non_global_ips": true,
  "http_request_block_regex": null,
  "icon_blacklist_non_global_ips": true,
  "icon_blacklist_regex": null,
  "icon_cache_folder": "data/icon_cache",
  "icon_cache_negttl": 259200,
  "icon_cache_ttl": 2592000,
  "icon_download_timeout": 10,
  "icon_redirect_code": 302,
  "icon_service": "internal",
  "incomplete_2fa_schedule": "30 * * * * *",
  "incomplete_2fa_time_limit": 3,
  "increase_note_size_limit": false,
  "invitation_expiration_hours": 120,
  "invitation_org_name": "Vaultwarden",
  "invitations_allowed": false,
  "ip_header": "X-Real-IP",
  "job_poll_interval_ms": 30000,
  "log_file": null,
  "log_level": "debug",
  "log_timestamp_format": "%Y-%m-%d %H:%M:%S.%3f",
  "login_ratelimit_max_burst": 10,
  "login_ratelimit_seconds": 60,
  "org_attachment_limit": null,
  "org_creation_users": "",
  "org_events_enabled": false,
  "org_groups_enabled": false,
  "password_hints_allowed": true,
  "password_iterations": 600000,
  "push_enabled": false,
  "push_identity_uri": "https://identity.bitwarden.com",
  "push_installation_id": "***",
  "push_installation_key": "***",
  "push_relay_uri": "https://push.bitwarden.com",
  "reload_templates": false,
  "require_device_email": false,
  "rsa_key_filename": "data/rsa_key",
  "send_purge_schedule": "0 5 * * * *",
  "sendmail_command": null,
  "sends_allowed": true,
  "sends_folder": "data/sends",
  "show_password_hint": false,
  "signups_allowed": false,
  "signups_domains_whitelist": "",
  "signups_verify": false,
  "signups_verify_resend_limit": 6,
  "signups_verify_resend_time": 3600,
  "smtp_accept_invalid_certs": false,
  "smtp_accept_invalid_hostnames": false,
  "smtp_auth_mechanism": null,
  "smtp_debug": false,
  "smtp_embed_images": true,
  "smtp_explicit_tls": null,
  "smtp_from": "****************",
  "smtp_from_name": "Vaultwarden",
  "smtp_host": "***********",
  "smtp_password": "***",
  "smtp_port": 587,
  "smtp_security": "starttls",
  "smtp_ssl": null,
  "smtp_timeout": 15,
  "smtp_username": "****************",
  "templates_folder": "data/templates",
  "tmp_folder": "data/tmp",
  "trash_auto_delete_days": null,
  "trash_purge_schedule": "0 5 0 * * *",
  "use_sendmail": false,
  "use_syslog": false,
  "user_attachment_limit": null,
  "user_send_limit": null,
  "web_vault_enabled": true,
  "web_vault_folder": "web-vault/",
  "yubico_client_id": null,
  "yubico_secret_key": null,
  "yubico_server": null
}

Vaultwarden Build Version

v1.32.0-040e2a7b

Deployment method

Official Container Image

Custom deployment method

No response

Reverse Proxy

nginx 1.27.0

Host/Server Operating System

Linux

Operating System Version

ubuntu 22.04

Clients

Browser Extension, Desktop

Client Version

No response

Steps To Reproduce

Go to login page and Input password
Click on 'login'
error

Expected Result

I declare in advance that I used the beta version of the code to test whether it was a real issue, and this is also the issue in the official version.

I have configured the SMTP server (QQ email) on the admin page
Click on test, an error message appears as shown below, but the test email received the email
Change the SMTP service provider, email sending is normal, and the software is working properly.
There was no problem in using it before. So I initially think that the qq mailbox may have made some changes to the return value or other aspects, resulting in an abnormality in the code?

Actual Result

like Expected Result

Logs

[2024-09-25 22:35:21.678][request][INFO] GET /vw_static/bootstrap.bundle.js
[2024-09-25 22:35:21.679][response][INFO] (static_files) GET /vw_static/<filename> [2] => 200 OK
[2024-09-25 22:35:29.031][request][INFO] GET /alive
[2024-09-25 22:35:29.031][response][INFO] (alive) GET /alive => 200 OK
[2024-09-25 22:35:43.084][request][INFO] POST /admin/test/smtp
[2024-09-25 22:35:44.002][vaultwarden::mail][DEBUG] SMTP error: lettre::transport::smtp::Error {
    kind: Response,
    source: "error Tag at: \0\0\0\u{1a}\0\0\0\n",
}
[2024-09-25 22:35:44.002][vaultwarden::mail][ERROR] SMTP error: response error: error Tag at:

[2024-09-25 22:35:44.003][response][INFO] (test_smtp) POST /admin/test/smtp => 400 Bad Request
[2024-09-25 22:35:57.910][vaultwarden::api::core::accounts][DEBUG] Purging auth requests
[2024-09-25 22:35:57.910][vaultwarden::api::core::two_factor::duo_oidc][DEBUG] Purging Duo authentication contexts
[2024-09-25 22:35:57.910][vaultwarden::api::core::two_factor][DEBUG] Sending notifications for incomplete 2FA logins
[2024-09-25 22:35:57.911][vaultwarden::api::core::two_factor][INFO] User 461646668@qq.com did not complete a 2FA login within the configured time limit. IP: 192.168.93.124
[2024-09-25 22:35:58.919][vaultwarden::mail][DEBUG] SMTP error: lettre::transport::smtp::Error {
    kind: Response,
    source: "error Tag at: \0\0\0\u{1a}\0\0\0\n",
}
[2024-09-25 22:35:58.919][vaultwarden::mail][ERROR] SMTP error: response error: error Tag at:

[2024-09-25 22:35:58.920][vaultwarden::api::core::two_factor][ERROR] Error sending incomplete 2FA email: SMTP error: response error: error Tag at:

[2024-09-25 22:35:58.920][vaultwarden::api::core::two_factor][INFO] User 461646668@qq.com did not complete a 2FA login within the configured time limit. IP: 192.168.93.124
[2024-09-25 22:35:59.868][vaultwarden::mail][DEBUG] SMTP error: lettre::transport::smtp::Error {
    kind: Response,
    source: "error Tag at: \0\0\0\u{1a}\0\0\0\n",
}
[2024-09-25 22:35:59.868][vaultwarden::mail][ERROR] SMTP error: response error: error Tag at:

[2024-09-25 22:35:59.869][vaultwarden::api::core::two_factor][ERROR] Error sending incomplete 2FA email: SMTP error: response error: error Tag at:




[2024-09-25 22:36:29.099][request][INFO] GET /alive
[2024-09-25 22:36:29.099][response][INFO] (alive) GET /alive => 200 OK

Screenshots or Videos

No response

Additional Context

No response

*Originally created by @CJSen on 9/25/2024* ### Vaultwarden Support String ### Your environment (Generated via diagnostics page) * Vaultwarden version: v1.32.0-040e2a7b * Web-vault version: v2024.6.2c * OS/Arch: linux/x86_64 * Running within a container: true (Base: Alpine) * Environment settings overridden: true * Uses a reverse proxy: true * IP Header check: true (X-Real-IP) * Internet access: false * Internet access via a proxy: false * DNS Check: true * Browser/Server Time Check: true * Server/NTP Time Check: n/a * Domain Configuration Check: false * HTTPS Check: false * Database type: SQLite * Database version: 3.46.1 * Clients used: * Reverse proxy and version: * Other relevant information: ### Config (Generated via diagnostics page) <details><summary>Show Running Config</summary> **Environment settings which are overridden:** SIGNUPS_ALLOWED, INVITATIONS_ALLOWED, SHOW_PASSWORD_HINT, ADMIN_TOKEN, SMTP_HOST, SMTP_SECURITY, SMTP_PORT, SMTP_FROM, SMTP_USERNAME, SMTP_PASSWORD ```json { "_duo_akey": null, "_enable_duo": true, "_enable_email_2fa": true, "_enable_smtp": false, "_enable_yubico": true, "_icon_service_csp": "", "_icon_service_url": "", "_ip_header_enabled": true, "_max_note_size": 10000, "_smtp_img_src": "cid:", "admin_ratelimit_max_burst": 3, "admin_ratelimit_seconds": 300, "admin_session_lifetime": 20, "admin_token": "***", "allowed_iframe_ancestors": "", "attachments_folder": "data/attachments", "auth_request_purge_schedule": "30 * * * * *", "authenticator_disable_time_drift": false, "data_folder": "data", "database_conn_init": "", "database_max_conns": 10, "database_timeout": 30, "database_url": "***************", "db_connection_retries": 15, "disable_2fa_remember": false, "disable_admin_token": false, "disable_icon_download": false, "domain": "****://*********", "domain_origin": "****://*********", "domain_path": "", "domain_set": true, "duo_context_purge_schedule": "30 * * * * *", "duo_host": null, "duo_ikey": null, "duo_skey": null, "duo_use_iframe": false, "email_2fa_auto_fallback": false, "email_2fa_enforce_on_verified_invite": false, "email_attempts_limit": 3, "email_change_allowed": true, "email_expiration_time": 600, "email_token_size": 6, "emergency_access_allowed": true, "emergency_notification_reminder_schedule": "0 3 * * * *", "emergency_request_timeout_schedule": "0 7 * * * *", "enable_db_wal": true, "enable_websocket": true, "enforce_single_org_with_reset_pw_policy": false, "event_cleanup_schedule": "0 10 0 * * *", "events_days_retain": null, "experimental_client_feature_flags": "fido2-vault-credentials", "extended_logging": true, "helo_name": null, "hibp_api_key": null, "http_request_block_non_global_ips": true, "http_request_block_regex": null, "icon_blacklist_non_global_ips": true, "icon_blacklist_regex": null, "icon_cache_folder": "data/icon_cache", "icon_cache_negttl": 259200, "icon_cache_ttl": 2592000, "icon_download_timeout": 10, "icon_redirect_code": 302, "icon_service": "internal", "incomplete_2fa_schedule": "30 * * * * *", "incomplete_2fa_time_limit": 3, "increase_note_size_limit": false, "invitation_expiration_hours": 120, "invitation_org_name": "Vaultwarden", "invitations_allowed": false, "ip_header": "X-Real-IP", "job_poll_interval_ms": 30000, "log_file": null, "log_level": "debug", "log_timestamp_format": "%Y-%m-%d %H:%M:%S.%3f", "login_ratelimit_max_burst": 10, "login_ratelimit_seconds": 60, "org_attachment_limit": null, "org_creation_users": "", "org_events_enabled": false, "org_groups_enabled": false, "password_hints_allowed": true, "password_iterations": 600000, "push_enabled": false, "push_identity_uri": "https://identity.bitwarden.com", "push_installation_id": "***", "push_installation_key": "***", "push_relay_uri": "https://push.bitwarden.com", "reload_templates": false, "require_device_email": false, "rsa_key_filename": "data/rsa_key", "send_purge_schedule": "0 5 * * * *", "sendmail_command": null, "sends_allowed": true, "sends_folder": "data/sends", "show_password_hint": false, "signups_allowed": false, "signups_domains_whitelist": "", "signups_verify": false, "signups_verify_resend_limit": 6, "signups_verify_resend_time": 3600, "smtp_accept_invalid_certs": false, "smtp_accept_invalid_hostnames": false, "smtp_auth_mechanism": null, "smtp_debug": false, "smtp_embed_images": true, "smtp_explicit_tls": null, "smtp_from": "****************", "smtp_from_name": "Vaultwarden", "smtp_host": "***********", "smtp_password": "***", "smtp_port": 587, "smtp_security": "starttls", "smtp_ssl": null, "smtp_timeout": 15, "smtp_username": "****************", "templates_folder": "data/templates", "tmp_folder": "data/tmp", "trash_auto_delete_days": null, "trash_purge_schedule": "0 5 0 * * *", "use_sendmail": false, "use_syslog": false, "user_attachment_limit": null, "user_send_limit": null, "web_vault_enabled": true, "web_vault_folder": "web-vault/", "yubico_client_id": null, "yubico_secret_key": null, "yubico_server": null } ``` </details> ### Vaultwarden Build Version v1.32.0-040e2a7b ### Deployment method Official Container Image ### Custom deployment method _No response_ ### Reverse Proxy nginx 1.27.0 ### Host/Server Operating System Linux ### Operating System Version ubuntu 22.04 ### Clients Browser Extension, Desktop ### Client Version _No response_ ### Steps To Reproduce 1. Go to login page and Input password 2. Click on 'login' 3. error ### Expected Result I declare in advance that I used the beta version of the code to test whether it was a real issue, and this is also the issue in the official version. 1. I have configured the SMTP server (QQ email) on the admin page 2. Click on test, an error message appears as shown below, but the test email received the email <img width="690" alt="image" src="https://github.com/user-attachments/assets/a60ea081-17de-487d-872d-a0095a6f25ab"> ![image](https://github.com/user-attachments/assets/ead425f7-4552-42cf-a9b0-5a0c72dd2e6e) 3. Change the SMTP service provider, email sending is normal, and the software is working properly. 4. There was no problem in using it before. So I initially think that the qq mailbox may have made some changes to the return value or other aspects, resulting in an abnormality in the code? ### Actual Result like Expected Result ### Logs ```text [2024-09-25 22:35:21.678][request][INFO] GET /vw_static/bootstrap.bundle.js [2024-09-25 22:35:21.679][response][INFO] (static_files) GET /vw_static/<filename> [2] => 200 OK [2024-09-25 22:35:29.031][request][INFO] GET /alive [2024-09-25 22:35:29.031][response][INFO] (alive) GET /alive => 200 OK [2024-09-25 22:35:43.084][request][INFO] POST /admin/test/smtp [2024-09-25 22:35:44.002][vaultwarden::mail][DEBUG] SMTP error: lettre::transport::smtp::Error { kind: Response, source: "error Tag at: \0\0\0\u{1a}\0\0\0\n", } [2024-09-25 22:35:44.002][vaultwarden::mail][ERROR] SMTP error: response error: error Tag at: [2024-09-25 22:35:44.003][response][INFO] (test_smtp) POST /admin/test/smtp => 400 Bad Request [2024-09-25 22:35:57.910][vaultwarden::api::core::accounts][DEBUG] Purging auth requests [2024-09-25 22:35:57.910][vaultwarden::api::core::two_factor::duo_oidc][DEBUG] Purging Duo authentication contexts [2024-09-25 22:35:57.910][vaultwarden::api::core::two_factor][DEBUG] Sending notifications for incomplete 2FA logins [2024-09-25 22:35:57.911][vaultwarden::api::core::two_factor][INFO] User 461646668@qq.com did not complete a 2FA login within the configured time limit. IP: 192.168.93.124 [2024-09-25 22:35:58.919][vaultwarden::mail][DEBUG] SMTP error: lettre::transport::smtp::Error { kind: Response, source: "error Tag at: \0\0\0\u{1a}\0\0\0\n", } [2024-09-25 22:35:58.919][vaultwarden::mail][ERROR] SMTP error: response error: error Tag at: [2024-09-25 22:35:58.920][vaultwarden::api::core::two_factor][ERROR] Error sending incomplete 2FA email: SMTP error: response error: error Tag at: [2024-09-25 22:35:58.920][vaultwarden::api::core::two_factor][INFO] User 461646668@qq.com did not complete a 2FA login within the configured time limit. IP: 192.168.93.124 [2024-09-25 22:35:59.868][vaultwarden::mail][DEBUG] SMTP error: lettre::transport::smtp::Error { kind: Response, source: "error Tag at: \0\0\0\u{1a}\0\0\0\n", } [2024-09-25 22:35:59.868][vaultwarden::mail][ERROR] SMTP error: response error: error Tag at: [2024-09-25 22:35:59.869][vaultwarden::api::core::two_factor][ERROR] Error sending incomplete 2FA email: SMTP error: response error: error Tag at: [2024-09-25 22:36:29.099][request][INFO] GET /alive [2024-09-25 22:36:29.099][response][INFO] (alive) GET /alive => 200 OK ``` ### Screenshots or Videos _No response_ ### Additional Context _No response_

MrUnknownDE closed this issue

2026-04-06 00:52:26 +02:00

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Reference: github/vaultwarden#917