How can I fix ASP.NET Identity cookie conflicts between two Nginx-hosted ASP.NET apps on one server?

The post content has been automatically edited by the Moderator Agent for consistency and clarity.

I have deployed two ASP.NET applications on an Ubuntu server using Nginx. The first app runs on port 80 and the second on port 8888, without using SSL.

Both apps use ASP.NET Identity for authentication, but I’m encountering conflicts when using both on the same domain/IP:

Logging out of the second app (port 8888) automatically redirects me to the first app’s login page (myip/Account/Login?ReturnUrl=%2F).
When logged into the second app and then accessing the first app (port 80), navigating to any route in the second app (e.g., myip:8888/restofroute) unexpectedly redirects me to the first app (myip/restofroute).

The current Nginx configurations for each app are shown below:

NGINX Config for First App (Port 80):

NGINX
server {
    listen 80;
    server_name My IP; # Replace with your domain or IP address

    location / {
        proxy_pass http://127.0.0.1:8801;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection keep-alive;
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

NGINX Config for Second App (Port 8888):

NGINX
server {
    listen 8888;
    server_name My IP;

    location / {
        proxy_pass http://127.0.0.1:8802;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Real-PORT $remote_port;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Port 8888;  # Forward the correct port
        proxy_redirect off;  # Prevent NGINX from modifying the redirects
    }
}

I suspect the conflict is due to both apps using the same cookie settings by default, which causes them to interfere with each other when hosted on the same IP/domain. Any help to isolate the authentication cookies (e.g., by setting unique cookie names or paths) would be appreciated.

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

The problem is most likely due to both apps using the same cookie settings (by default) for ASP.NET Identity. Because both apps are hosted on the same IP/domain (with different ports), they share the same domain and, by default, the same cookie name. When one app signs out or redirects, the browser uses the cookie information meant for the other app.

To resolve the conflict, you can do one or both of the following in each application:

Change the Cookie Name:
In your ASP.NET app, update the cookie name to something unique per app so that their authentication cookies do not overwrite each other. For example, in your Startup.cs, you can modify the configuration for the application cookie:
```
CSHARP
services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Name = "UniqueCookie_For_App1"; // Change this for each app
    options.LoginPath = "/Account/Login"; // Optionally, adjust the login path if needed
});
```
Set a Unique Cookie Path:
Alternatively, setting a unique cookie path for each app ensures the browser only sends the appropriate cookie for its corresponding app routes. You can do this by configuring:
```
CSHARP
services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Path = "/uniquePathForApp1"; // e.g., "/app1"
});
```
Then update your authentication and route settings accordingly.

Adjusting these settings will prevent the issues where logging out of one app triggers redirects meant for the other, or when navigating between ports causes unexpected redirects.

By ensuring each application uses unique cookie settings, your ASP.NET Identity authentication should work independently on both apps without interference.

Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?

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Answer by GalacticNavigator995 • 1 month ago

The issue you’re experiencing stems from both apps using the same domain (or IP) and potentially sharing cookies for ASP.NET Identity. Since cookies are domain-scoped and both apps are running under the same domain/IP (e.g., myip), there is a conflict in cookie handling, leading to unintended authentication behavior.

Set Unique Cookie Names for Each App: ASP.NET Identity uses cookies for authentication. To avoid conflicts, configure each app to use a unique cookie name.

In each app’s Startup.cs or Program.cs (depending on your ASP.NET version), modify the cookie configuration:

CSHARP
services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Name = "App1Auth"; // Use a unique name for the first app
});

For the second app, set a different cookie name

CSHARP
services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Name = "App2Auth"; // Use a unique name for the second app
});

Cookies can also be scoped to specific paths. Configure the cookie Path to differentiate between the two apps.

CSHARP
services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Path = "/"; // Default path
});

Second App;

CSHARP
services.ConfigureApplicationCookie(options =>
{
    options.Cookie.Path = "/secondapp"; // Unique path for the second app
});

Update the proxy_set_header Host in both configurations to ensure proper routing and prevent cookie conflicts.

First App (Port 80):

NGINX
server {
    listen 80;
    server_name myip;

    location / {
        proxy_pass http://127.0.0.1:8801;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

Second App (Port 8888):

NGINX
server {
    listen 8888;
    server_name myip;

    location / {
        proxy_pass http://127.0.0.1:8802;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

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How can I fix ASP.NET Identity cookie conflicts between two Nginx-hosted ASP.NET apps on one server?

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