unable to login into Design Studio

Dear Members,

I am not able to login into SAP Design Studio client tool to BI Platform since morning. Getting below error.

Till yesterday, it was working fine. I checked with admin team, if they have made any changes on the server. In Local Mode it is working fine perfectly.

I tried to search over SCN but did not found anything related. Kindly provide inputs if anyone have faced such issues.

Environment Details:

BI 4.1 SP4

SAP Design Studio 1.5

Thanks,
Rakesh