Error Export to File

I have a question.When user click on "Export to File", if the url is server IP address (" http://111.222.2.20/ "), i am able to generate the .csv file , but if replaced with public IP address (e.g test.mis.sg:1111 - instead of 111.222.2.20 ), i am getting error.
Here is the error code displayed on the screen
Error creating Export Text File
System error: -2147012891
Here is system log file generated .
Mar 15 2016 15:07:44.561 2316 5216 5 START - doEndpointPost URL: http://test.mis.sg:1111/sdata/crmj/async/spreadsheetTask?trackingId=849085B9-8E5C-4819-95CA-C1ADF1ABD4D4&type=CSV&root=D%3A%5CCRM%5CCRM%5CLibrary%5C&inputfile=D%3A%5CCRM%5CCRM%5CLibrary%5CTemporary+Saved+Search_admin03.csv&SID=59659468846377
If possible , please help me to resolve this issue .