Unable to open the IB page

Hi,

When I run the SAP Logon.I am getting SAP Easylogon.Where as when I run the tcode:SXMB_IFR it is showing the Page cannot be displayed error.Actually daily I well worked for ID and IR but today suddenly I got the problem.Not only for me.All the clients of that server got the same problem.Can any body guide regarding this error.