Hmmm, In this case to research such situation more information is required about configuration like: init.ora files, tnsnames.ora/sqlnet.ora files and current dns resolutions from both sides, outputs from v$dataguard_* views would be handy as well. PS: are you using custom TNS_ADMIN location ? --romas On Mon, Sep 8, 2008 at 9:39 AM, Charles Schultz <sacrophyte@xxxxxxxxx>wrote: > Romas, great question. > > Looking back at the sequence of events, it does appear that the DNS > configuration was such that the primary was trying to ship logs to itself > for about 5 minutes after the last switchover. However, after that was > corrected, the configuration ran without a hitch until the standby was > restarted a few weeks later. > > > >