How to resolve "No protocol specified" error
Error 1) [oracle@prod ~]$ dbca No protocol specified Error 2) [oracle@prod ~]$ netca Oracle Net Services Configuration: No protocol specified Error: null Check the trace file for details: /u01/app/oracle/cfgtoollogs/netca/trace_OraDb11g_home1-1901166PM3102.log Oracle Net Services configuration failed. The exit code is 1 Solution Step 1) login as root user Step 2) run command xhost + this command allows you to use any graphical tool Example: - [root@prod Desktop]# xhost + access control disabled, clients can connect from any host Step 3) Now again run graphical tool utility command, that issue will get resolved now. [oracle@prod ~]$ dbca