How to increase the per-domain cookie limit of IE from 20 to 50
By default, Internet Explorer can store a maximum of 20 cookies for each domain. If a server in the domain sends more than 20 cookies to a client computer, the browser on the client computer automatically discards some old cookies.
Each cookie consists of a single name-value pair. This pair may be followed by attribute-value pairs that are separated by semicolons.
This limit has been increased to simplify the development and the hosting of Web applications on domains that must use many cookies. To increase the number of cookies that Internet Explorer can store for each domain from 20 to 50, install update 937143. To download this update, visit the following Web site:
After you install this update, the following two limits remain unchanged:
• The document.cookie property can retrieve only 4,096 bytes of a cookie on a client computer. If the cookie string is longer than 4,096 bytes, the property returns an empty string.
• Internet Explorer and the HTTP Wininet API ignore the Set-Cookie header if its length exceeds 5,118 bytes.
For functionality and performance reasons, Microsoft recommend that you use as few cookies as possible and that the cookies be as small as possible. Additionally, applications should be able to handle the loss of a cookie.