Since your question is related to handling 403 error (will this affect the end result of updating session time?), And what is 403.
So, handle this error, you can register or notify.
$.ajax({
type: "POST",
url: "KeepAliveDummy.aspx",
success: function (response) {
},
error: function (xhr, ajaxOptions, thrownError) {
if(xhr.status==403) {
}
}
});
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