On Redirect - Failed to generate a user instance of SQL Server...
- by Craig Russell
Hello (this is a long post sorry),
I am writing a application in ASP.NET MVC 2 and I have reached a point where I am receiving this error when I connect remotely to my Server.
Failed to generate a user instance of SQL Server due to failure in retrieving the user's local application data path. Please make sure the user has a local user profile on the computer. The connection will be closed.
I thought I had worked around this problem locally, as I was getting this error in debug when site was redirected to a baseUrl if a subdomain was invalid using this code:
protected override void Initialize(RequestContext requestContext)
{
string[] host = requestContext.HttpContext.Request.Headers["Host"].Split(':');
_siteProvider.Initialise(host, LiveMeet.Properties.Settings.Default["baseUrl"].ToString());
base.Initialize(requestContext);
}
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (Site == null)
{
string[] host = filterContext.HttpContext.Request.Headers["Host"].Split(':');
string newUrl;
if (host.Length == 2)
newUrl = "http://sample.local:" + host[1];
else
newUrl = "http://sample.local";
Response.Redirect(newUrl, true);
}
ViewData["Site"] = Site;
base.OnActionExecuting(filterContext);
}
public Site Site
{
get
{
return _siteProvider.GetCurrentSite();
}
}
The Site object is returned from a Provider named siteProvider, this does two checks, once against a database containing a list of all available subdomains, then if that fails to find a valid subdomain, or valid domain name, searches a memory cache of reserved domains, if that doesn't hit then returns a baseUrl where all invalid domains are redirected.
locally this worked when I added the true to Response.Redirect, assuming a halting of the current execution and restarting the execution on the browser redirect.
What I have found in the stack trace is that the error is thrown on the second attempt to access the database.
#region ISiteProvider Members
public void Initialise(string[] host, string basehost)
{
if (host[0].Contains(basehost))
host = host[0].Split('.');
Site getSite = GetSites().WithDomain(host[0]);
if (getSite == null)
{
sites.TryGetValue(host[0], out getSite);
}
_site = getSite;
}
public Site GetCurrentSite()
{
return _site;
}
public IQueryable<Site> GetSites()
{
return from p in _repository.groupDomains
select new Site
{
Host = p.domainName,
GroupGuid = (Guid)p.groupGuid,
IsSubDomain = p.isSubdomain
};
}
#endregion
The Linq query ^^^ is hit first, with a filter of WithDomain, the error isn't thrown till the WithDomain filter is attempted.
In summary: The error is hit after the page is redirected, so the first iteration is executing as expected (so permissions on the database are correct, user profiles etc) shortly after the redirect when it filters the database query for the possible domain/subdomain of current redirected page, it errors out.
