Object moved to here - C# login page error

I face a wierd error intermittently for some users , when i hit the URL. In the pageload event of the code , i am redirecting it to the login URL returned to me , by calling a webservice. Snapshot below

Response.Redirect("string loginurl returned by webservice");

 

For some users, it just redirects it fine without this error. For some users, I face below error. 

I tried to use below options by referring some links but doesn't work

 

1. Response.RedirectPermanent();

2. Set the 2nd parameter to false in Response.Redirect(); 

3. Set Response.Flush();

4. Set Response.RedirectLocation = "url";

5. Cleared browser cache history

 

Any assistance would be really helpful. Looking forward to your advice, please. Thanks.