Unable to Login into ArcGIS Server 10.1 manager - Dojo invalid key given error

[Swani_Jesus_Captonsiluvairajan]

When I try to login into the arcgis manager I get the following error in IE [see attachment]

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)
Timestamp: Mon, 7 Oct 2013 18:03:57 UTC


Message: Invalid key given: user-CDM_INC\siluvairajansj
Line: 14
Char: 4717
Code: 0
URI: http://localhost:6080/arcgis/manager/3143/js/dojo/dojo/dojo.js

[GraemeBrowning]

This problem has also been posted at GIS Stack Exchange where one answer has already been provided.