ASP, XML, timed out and refresh

[jslmvl]

I tried

http://127.0.0.1/...../test.asp?p=a

in my pC, my browser and IIS. The test.asp file includes these lines
Set xml = Server.CreateObject("Msxml2.ServerXMLHTTP")
p=Request.QueryString("p")
url = "

http://127.0.0.1/..../myPage.asp?p="

& p
xml.Open "GET", url, False
xml.Send
and got timed out error message
msxml3.dll error '80072ee2'
Immediately after that, I tried the same

http://127.0.0.1/...../test.asp?p=a

by clicking the refresh button and it worked without error!
Following that, I tried

http://127.0.0.1/...../test.asp?p=b

(instead of '?p=a', this time used '?p=b') and got the same error message again!

Any idea? What I should do now?