unable to login using UploadTool

login to https://accounts.zoho.com fails with uploadtool with user/password mismatch, but the error in logs are weird, because I am able to login manually over web-interface using the same credentials

The login from zohoreport-uploadtool was working good for long time and fails suddenly
any idea what would be wrong

<error>

Logging in
Error!!! Could not login. Could be because of username/password mismatch
Exception in thread "main" ServerException (HttpStatusCode 200 Error Code: 407 , URI: https://accounts.zoho.com, Action: ZOHO_LOGIN, Message: Could not login. Could be because of username/password mismatch)
    at com.adventnet.zoho.client.report.ReportClient.login(ReportClient.java:100)
    at com.adventnet.zoho.client.report.tool.CSVUploader.upload(CSVUploader.java:123)
    at com.adventnet.zoho.client.report.tool.CSVUploader.upload(CSVUploader.java:67)
    at com.adventnet.zoho.client.report.tool.CSVUploader.main(CSVUploader.java:47)

</error>