Error creating TREX Indexes

Hi everybody,

I have configured my KM contents correctly. My next step is create indexes for the searching with TREX. I'm trying to create one index in "System admin > system config > KM Manag > Index admin".

After intruduce my preferences I get next error "Index could not be created; creating index failed: Invalid entry in configuration: section nameserver, key backupserverlist, value tcpip://<nameserverhost2>:<nameserverport2> is invalid (Errorcode 7213)".

Could someone tell me where to configure that?

Thanks in advance!