Issue with Ajax or IIS(Version 6.0)

Hi All,
We are facing below mentioned issue.
Please suggest how to resolved it.
1. Exception information:
Exception information:
    Exception type: CryptographicException
    Exception message: Padding is invalid and cannot be removed.
 
Request information:
    Request URL: http://172.16.2.81/CDSWEB/WebResource.axd?d=4tnyPlge-gKPwidIlCBIzF6lj28KZdZVVuC6I8CTV3NridrN_HEroxvS7hSfcOwoVRVpBTR4Sb_V_4B3Na3_yg2&t=633359455673819456
    Request path: /CDSWEB/WebResource.axd
    User host address: 172.24.12.141
    User: CORP\Monu26065
    Is authenticated: True
    Authent ...