Trouble Connecting to SSIS in SQL Server 2017 (14.0.1)
If anyone else has a similar setup with SQL Server 2017 (14.0.1000) and SSIS (14.0) as of the creation of this question/answer SSMS 18.4 will not allow you to connect to SSIS. The only fix I have found is following Jacob's suggestion and downloading SSMS 17.9 which resolved the issue.