When you encounter an HTTP 400 error after authentication in an ABP microservice solution (Blazor Server UI) deployed on AWS, the most common causes are related to misconfiguration of redirect URIs, cookie settings, or OpenIddict client registration.
Here are the steps to resolve this issue:
Check Redirect URIs in OpenIddict Application Registration
RedirectUri and PostLogoutRedirectUri for your BlazorServer client in the OpenIddict application registration exactly match the URLs used by your Blazor Server app:
https://app.dreamlist.gr/signin-oidchttps://app.dreamlist.gr/signout-callback-oidcVerify AppSettings Configuration
appsettings.json, confirm:
"AuthServer": {
"Authority": "https://auth.dreamlist.gr",
"RequireHttpsMetadata": true,
"ClientId": "BlazorServer",
"ClientSecret": "1q2w3e*"
}
"App": {
"SelfUrl": "https://app.dreamlist.gr"
}
SelfUrl must match the actual public URL of your Blazor Server app.Check Cookie and SameSite Settings
Configure<CookiePolicyOptions>(options =>
{
options.MinimumSameSitePolicy = SameSiteMode.Lax;
});
services.ConfigureApplicationCookie(options =>
{
options.Cookie.Domain = ".dreamlist.gr";
options.Cookie.SameSite = SameSiteMode.Lax;
});
Check for Valid Redirect URI in AuthServer Logs
Check for Proxy or Load Balancer Headers
app.UseForwardedHeaders(new ForwardedHeadersOptions
{
ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto
});
ASPNETCORE_FORWARDEDHEADERS_ENABLED=true in your environment variables.Clear Browser Cookies and Test Again
Check for HTTPS Everywhere
If you follow these steps and ensure all URLs and settings are consistent, the 400 error after login should be resolved.
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When using ABP Studio or ABP Suite to create or add modules in a Blazor WebApp (with modularity enabled), the following behaviors are expected based on current ABP tooling:
This is a known limitation and has been reported by other users. The ABP team has acknowledged that, especially in modular and layered setups, menu registration and page linking are not fully automated. You must manually update the menu (typically in the MenuContributor class of your main Blazor project) to add links to the new module's pages.
To add a menu item for a new module page, update your MenuContributor like this:
public class MyMenuContributor : IMenuContributor
{
public Task ConfigureMenuAsync(MenuConfigurationContext context)
{
var administration = context.Menu.GetAdministration();
context.Menu.AddItem(
new ApplicationMenuItem(
"MyModule",
"My Module",
"/my-module-page"
)
);
return Task.CompletedTask;
}
}
After adding the menu item, rebuild and run your application to see the new module/page in the navigation.
This approach is currently required until ABP Studio/Suite automates menu and page registration for modular Blazor WebApp projects.
Sources:
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To resolve the GUID serialization issue after upgrading to ABP 9.2.0 (which uses MongoDB.Driver v3.x), you need to address the change in default GUID representation. The new driver expects GUIDs to be stored with the UuidStandard subtype, but your existing data uses UuidLegacy.
Here’s how to handle this:
Set the Global GuidRepresentation
At the very start of your application (before any MongoDB operations), set the default GUID representation to V3:
MongoDB.Bson.BsonDefaults.GuidRepresentationMode = MongoDB.Bson.GuidRepresentationMode.V3;
Migrate Existing Data (if needed)
UuidStandard (recommended for long-term compatibility).See the official MongoDB migration guide for details:
https://abp.io/docs/9.2/release-info/migration-guides/MongoDB-Driver-2-to-3
Update Serialization Settings (if you have custom settings)
If you have custom serialization logic, ensure you use the new GuidRepresentationMode.V3 and do not set the obsolete GuidRepresentation property.
Restart Your Application
After making these changes, restart your application to ensure the new settings take effect.
Sources:
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The root cause of your time conversion issue is the inconsistent configuration of AbpClockOptions between your MVC Web Application and your microservices. In your WebModule, you have set:
Configure<AbpClockOptions>(options =>
{
options.Kind = DateTimeKind.Local;
});
while in your DemoServiceModule, you have:
Configure<AbpClockOptions>(options =>
{
options.Kind = DateTimeKind.Utc;
});
This means your MVC UI is storing and interpreting DateTime values as "Local" (server time), but your microservices are using "UTC". In a distributed (microservices) environment, especially when running in containers (like Kubernetes), this will cause time drift and conversion errors, because each container/server may have a different local time or timezone configuration.
ABP recommends always using DateTimeKind.Utc for all services and UIs, and handling user time zone conversion at the UI or API boundary. This ensures all times are stored and transferred in UTC, and only converted to the user's time zone for display or input.
To fix this:
AbpClockOptions.Kind = DateTimeKind.Utc in all your modules (Web, API, microservices).IClock.ConvertToUserTime, IClock.ConvertToUtc) to convert between UTC and user time zone when displaying or accepting input.timestamp with time zone if you need to store offsets.For more details and best practices, see:
This approach will resolve the time drift and ensure consistent time handling across your distributed ABP application.
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If your ABP account is locked and you are unable to log in, you should follow these steps:
You can reach out to ABP support via their official support page or by emailing info@abp.io for assistance with account unlocking.
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The warning The localization source separator (::) not found. and the display of LongWelcomeMessage as a literal string indicate that the Angular localization key is not being resolved. This usually means the resource or key is not registered or loaded correctly in your Angular app.
In ABP Angular, localization keys must be referenced as ResourceName::Key. For example:
{{ 'MyProjectName::LongWelcomeMessage' | abpLocalization }}
You must also ensure that the resource and key are registered in your Angular module. In your app.module.ts, you should have something like:
import { provideAbpCore, withOptions } from '@abp/ng.core';
@NgModule({
providers: [
provideAbpCore(
withOptions({
localizations: [
{
culture: 'en',
resources: [
{
resourceName: 'MyProjectName',
texts: {
"LongWelcomeMessage": "Welcome to the application. This is a startup project based on the ABP framework. For more information visit"
}
}
]
}
]
}),
),
],
})
export class AppModule {}
If you only use backend localization, ensure the backend returns the correct resource and key, and that the Angular app is configured to use it.
Double-check that the resource name and key match exactly, and that you are using the correct separator (::).
If you recently upgraded, compare your app.module.ts and localization configuration with a fresh ABP template for your version, as breaking changes or template changes may have occurred.
For more details, see the official documentation:
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This error (startIndex ('-1') must be a non-negative value. (Parameter 'startIndex')) is a known issue that can occur in ABP Suite's CRUD Page Generator, especially after upgrades or when working with certain project/module configurations. It is typically caused by Suite failing to parse or locate expected code patterns in your DbContext or related files, often due to:
Check Your DbContext for Duplicates or Irregularities
DbSet properties or malformed code in your DbContext file.public DbSet<MyEntity> MyEntities { get; set; }
public DbSet<MyEntity> MyEntities { get; set; } // Duplicate!
Revert Manual Changes
Update ABP Suite
Remove and Re-Add Solution in Suite
Check Module Support
SaasService, IdentityService, AdministrationService). If you are targeting these, code generation may not work as expected.Check for Known Issues
Try with a Clean Project
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In ABP Blazor WebAssembly multi-tenant setups using subdomains, if logging into one tenant also authenticates you in all tenants (and host), the root cause is typically the authentication cookie's domain scope. By default, cookies are set for the parent domain (e.g., .local.test), making them accessible to all subdomains, which results in shared authentication across tenants.
To ensure tenant isolation, you must configure the authentication cookie to be scoped to each subdomain (tenant) rather than the parent domain. In Blazor WASM, this is handled by the OIDC provider and the backend's cookie settings.
Solution Steps:
Set Cookie Domain Per Subdomain:
t1.local.test, t2.local.test) instead of .local.test.Configure<CookieAuthenticationOptions>(IdentityConstants.ApplicationScheme, options =>
{
options.Cookie.Domain = null; // Do not set to .local.test
});
options.Cookie.Domain = null, the cookie will be scoped to the current subdomain.OIDC Redirect URIs:
appsettings.json for each client:
"RootUrl": "https://{0}.local.test:44334"
Blazor WASM RemoteServices Configuration:
Authority and BaseUrl to include the current tenant subdomain at runtime, as described in Step 5 of the referenced guide.Clear Cookies and Test:
Summary:
The issue is caused by the authentication cookie being shared across subdomains. Scoping the cookie to each subdomain resolves the problem and ensures proper tenant isolation.
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To request a reimbursement for an unwanted ABP Commercial renewal and to inquire about deleting your organization account, you should contact the ABP support team directly. There is no self-service option for deleting organization accounts or handling billing issues via the user interface.
Please use one of the following official channels:
Provide your organization details and explain your situation for a prompt resolution.
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The ABP CMS Kit does not provide an automatic mechanism to clean up or remove unused images that were previously uploaded and are no longer referenced in blog posts or pages. Uploaded files remain in storage even if they are not used in any content, which can lead to accumulation of unused images over time.
To handle this issue, you would need to implement a custom solution. A typical approach is:
This process requires custom development, as the CMS Kit does not include built-in support for orphaned file cleanup.
Sources:
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