for Webservices we are switching over to a openid connect based single sign on system.
Accessing an oidc enabled webservice will redirect to https://id.acc.gsi.de and present you with a login dialog
After authentication you will be redirected to the webservice.
If you are using a kerberized Browser and your system has a valid kerberos ticket, login to id.acc.gsi.de will be automatic.
If you are accessing a different oidc based webservice, the previous login to id.acc.gsi.de is still valid and you are automatically logged in.