> For the complete documentation index, see [llms.txt](https://docs.snyk.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snyk.io/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/troubleshooting/authentication/troubleshooting-login-failed-with-login-form.md). # Troubleshoot login failed with login form In targets with authentication, Snyk API & Web must log in to reach areas reserved for authenticated users. If scans fail to log in using a login form, follow these troubleshooting steps. ## The problem When running scans on a target with a login form, Snyk API & Web fails to log in. ## Troubleshoot the problem Work through the following steps to identify possible causes and solutions. ### Step 1: Test the current credentials Verify the credentials configured in target settings are still valid. 1. Navigate to the **Targets** page. 2. Click the **gear icon** for the target to access settings. 3. Open the **Authentication** tab and review the **LOGIN FORM** configuration. 4. Note the login URL and credentials. 5. Open a browser and navigate to the target's login URL. 6. Attempt to log in with the current credentials. If the login fails, check the following causes and solutions: | Cause | Solution | | ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | The credentials are invalid. | Obtain valid login credentials and update them in target settings. Visit [Login form](/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/configure-targets/configure-authentication/configure-login-form.md). | | The credentials expired. | Obtain new login credentials and update them in target settings. Visit [Login form](/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/configure-targets/configure-authentication/configure-login-form.md). | ### Step 2: Test the login flow Verify the login flow is still a login form. 1. Open a browser and navigate to the target's login URL. 2. Check if the login page displays a standard login form. If the login is not a login form, the target authentication fails. | Cause | Solution | | --------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | The login flow is not a login form but a complex login (for example, multi-step login). | Configure the target authentication to use a login sequence, which supports complex logins. Visit [Login sequence](/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/configure-targets/configure-authentication/configure-login-sequence.md). | ### Step 3: Check the field names Verify the field name values configured in target authentication. 1. Navigate to the **Targets** page. 2. Click the **gear icon** for the target to access settings. 3. Open the **Authentication** tab and review the **LOGIN FORM** configuration. 4. Note the **FIELD NAME** values for username and password fields. 5. Open a browser and navigate to the target's login URL. 6. Right-click and select **Inspect** to see the attributes of input fields on the login form. 7. Verify the **FIELD NAME** values contain a valid "id", "name", or CSS selector from the login form. If the **FIELD NAME** values are not valid, Snyk API & Web cannot authenticate. | Cause | Solution | | ----------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | The **FIELD NAME** value does not contain a valid "id", "name", or CSS selector that identifies that input field in the login form. | Update the **FIELD NAME** value with the "id", "name", or CSS selector that uniquely identifies that input field in the login form. Visit [Login form](/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/configure-targets/configure-authentication/configure-login-form.md). | ### Step 4: Test for a blocking WAF Check if a Web Application Firewall (WAF) is blocking access to the authentication page. 1. Open a browser in incognito mode and navigate to the target's URL. 2. Navigate to the authentication page with the login form. 3. Check if a WAF blocks access. If a WAF blocks access to the authentication page, Snyk API & Web cannot authenticate. | Cause | Solution | | ------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | A WAF is blocking access to the authentication page with the login form. | Add Snyk API & Web IPs to the WAF's allowlist. Visit [Configure IPs in WAFs](/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/start-scanning/overview-scan-access-and-connectivity/configure-ips-in-wafs.md). | After following these steps and applying the solutions, scans can log in to your target. For more information, visit [Configure authentication](/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/configure-targets/configure-authentication.md). --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.snyk.io/scan-fix-and-prevent/scan-with-snyk/snyk-api-web/troubleshooting/authentication/troubleshooting-login-failed-with-login-form.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.