func ResetNSURLCredentials() {

    let dictAllCredentials : NSDictionary = NSURLCredentialStorage.sharedCredentialStorage().allCredentials
    let protectionSpace : NSURLProtectionSpace = NSURLProtectionSpace(host: "xyz.com", port: 0, `protocol`: "http", realm: nil, authenticationMethod: nil)
    //let tempDictionary : NSDictionary = NSURLCredentialStorage.sharedCredentialStorage().credentialsForProtectionSpace(protectionSpace)

    if(dictAllCredentials.count > 0 ){

        var protectionSpaceEnumerator=dictAllCredentials.keyEnumerator() as NSEnumerator
        var urlProtectionSpace : AnyObject?

        while(urlProtectionSpace as NSEnumerator == protectionSpaceEnumerator.nextObject() as NSEnumerator){

            var userNameEnumerator : NSEnumerator = dictAllCredentials.objectForKey(urlProtectionSpace).keyEnumerator()
            var userName : NSEnumerator = NSEnumerator()

            while(userName == userNameEnumerator.nextObject() as NSEnumerator){

                var credential : NSURLCredential = dictAllCredentials.objectForKey(urlProtectionSpace).objectForKey(userName) as NSURLCredential
                NSURLCredentialStorage.sharedCredentialStorage().removeCredential(credential, forProtectionSpace: protectionSpace)


            }

        }

    }

}