ASP.NET Core 6: implementing JWT Token Expiration optimization guide as Expected
I'm working with a frustrating scenario with JWT token expiration in my ASP.NET Core 6 Web API. I have configured JWT authentication in `Startup.cs` as follows: ```csharp services.AddAuthentication(options => { options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; }).AddJwtBearer(options => { options.TokenValidationParameters = new TokenValidationParameters { ValidateIssuer = true, ValidateAudience = true, ValidateLifetime = true, ValidateIssuerSigningKey = true, ValidIssuer = "myissuer", ValidAudience = "myaudience", IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("my_secret_key")), ClockSkew = TimeSpan.Zero // No clock skew }; }); ``` I'm generating the token like this: ```csharp var tokenHandler = new JwtSecurityTokenHandler(); var tokenDescriptor = new SecurityTokenDescriptor { Subject = new ClaimsIdentity(new Claim[] { new Claim(ClaimTypes.Name, user.Username), }), Expires = DateTime.UtcNow.AddMinutes(30), // 30 minutes expiration SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(Encoding.UTF8.GetBytes("my_secret_key")), SecurityAlgorithms.HmacSha256Signature) }; var token = tokenHandler.CreateToken(tokenDescriptor); var tokenString = tokenHandler.WriteToken(token); ``` However, when I try to use the token after it has expired, I get the following behavior message: `"The token has expired."` and yet, I'm able to use the same token a few minutes after it should have expired. This behavior is inconsistent and leads to confusion in the authentication flow. I've double-checked that `ClockSkew` is set to `TimeSpan.Zero`, which should remove any leeway, and I've verified the system time on my server is accurate. I've also tested with different expiration durations, but the scenario continues. Is there something I might be missing, or is there a known scenario with JWT token expiration handling in ASP.NET Core 6? Any insights or suggestions would be greatly appreciated! I'm working on a application that needs to handle this. Is there a better approach?