Specified argument was out of the range of valid values. Par

There is an ldap authentication on this website. It was configured successfully and was working fine up until today, but now I can no longer log in to sitefinity and receive the following error. 

[ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: validFrom] Microsoft.IdentityModel.Tokens.SessionSecurityToken..ctor(IClaimsPrincipal claimsPrincipal, UniqueId contextId, String context, String endpointId, Nullable`1 validFrom, Nullable`1 validTo, SymmetricSecurityKey key) +978 Telerik.Sitefinity.Security.Claims.SitefinityClaimsAuthenticationModule.AuthenticatePrincipalWithCurrentToken(IClaimsPrincipal principal, Boolean persistent) +451 Telerik.Sitefinity.Security.Claims.SitefinityClaimsAuthenticationModule.AuthenticatePrincipalWithCurrentToken(IClaimsPrincipal principal) +249 Telerik.Sitefinity.Security.Claims.SitefinityClaimsAuthenticationModule.AuthenticateRequest(HttpContextBase context, String rawToken, String tokenType, String[] removeParams) +958 Telerik.Sitefinity.Security.Claims.SitefinityClaimsAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs args) +781 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165