After starting applications on a Java server (for example, portal iViews or Wiki pages) within NWBC, all following application starts bring up logon dialogs in HTML and SAP GUI based applications.
This is caused by SAP's J2EE engine overwriting NWBC's MYSAPSSO2 cookie, which was received after the first login and which is vital for starting applications on the connected server.
Configure the systems to issue a MYSAPSSO2 cookie for the host. This can be done by using the UME property ume.logon.security.relax_domain.level = 0.
For more information, see SAP note 1368384 .