I've just updated a CF16 Server to CF21. There's this neat migration tool that popped up during the installation that helps you port all the settings to the new Insallation. After the update everything was working fine except when trying to run anything cfhtmltopdf related. After a hour of debugging I realized that the one migrated PDF Service Manager was misconfigured to Port 8989, which I think is the default for CF16, whereas CF21 starts the pdfg service on Port 8993. I simply had to change the port. So everything is running fine now, but i'm posting this just as a little PSA in case anyone else is running into this issue in the future 🙂

This is really good to know! @priyank_adobe should I pop a JIRA ticket in for this issue to double check we're not setting that to the wrong value by default in the base install of 21 vs 16?

We will have to test this behavior.