After performing an in-place upgrade on a SQL 2008 R2 server to SQL 2014, l had access issue to SSIS 2014.
I also noticed [rom SSCM SQL Server Configuration Mananger] that SSIS 2008 R2 ie SSIS version 10.0 was still running, using the NT Autohoritynetworkservice account while SSIS 2014 ie version 12.0 was also running – but using the nt servicemsdtsserver120 local account.
From a remote SSMS 2008 R2 window, l could access the target SSIS instance and it shows up with version 10.50.4000 [the number for SSIS 2008 R2]
From the local upgraded server’s SSMS 2014 , connecting to the target SSIS 2014 shows a connection with version number 12.0.2000
Steps taken to resolve the initial access issue.