I am trying to create a site collection programmatically. 
It has worked for about 6 months, but after the servers have been updated (various patches) it doesn’t work anymore (we have 3 servers: 1 development, 1 test, 1 production). It is still working in my development environment which hasn’t been updated, but not on the two others.
I don’t receive any error messages, it just hangs at the code that is supposed to add the site collection (see code below).
I am using Windows Server 2003 R2  and Sharepoint 2007 (version 12.0.0.6421 ).
It doesn’t give me any errors, it just hangs until Internet Explorer comes with a “request timed out” response.
If I try and debug the code, the code just stops there and nothing happens. No error messages or anything.
    public static string CreateSPAccountSite(string siteName)
    {
        string url = "";
        SPSecurity.RunWithElevatedPrivileges(delegate()
        {
            SPWeb web = SPContext.Current.Web;
            using (SPSite siteCollectionOuter = new SPSite(web.Site.ID))
            {
                SPWebApplication webApp = siteCollectionOuter.WebApplication;
                SPSiteCollection siteCollection = webApp.Sites;
                SPSite site = siteCollection.Add("sites/" + siteName, siteName, "Auto generated Site collection.", 1033, "STS#0", siteCollectionOuter.Owner.LoginName, siteCollectionOuter.Owner.Name, siteCollectionOuter.Owner.Email); //Hangs here                    site.PortalName = "Portal";
                site.PortalUrl = mainUrl; // https://www.ourdomain.net
                url = site.Url;
            }
        });
        return url; //Should be "https://www.outdomain.net/sites/siteName"
    }