Thank you for this post but seemingly my issue is with the servlet address.
My company ONLY allows port 443 communication to the internet, I removed port 443 from IIS and configured tomcat on that port which works fine, when I add FQDN it still continues to work fine (example ---> 'https://<server_name>.<FQDN>/CAisd/pdmweb.exe) and servlet address is (example ---> 'https://<server_name>.<FQDN>:443/CAisd/UploadServlet) within repository can I still attach ... everything fine up to this point.
The problem I have is when I add DNS (FQDN included in DNS entry) it stops working (example ---> 'https://<DNS>.<FQDN>/CAisd/pdmweb.exe)
I also updated servlet in repository to reflect the same but still fails (example ---> 'https://<DNS>.<FQDN>/CAisd/UploadServlet)
Entering URL 'https://support.company.com' works fine and takes me to full URL 'https://support.company.com/CAisd/pdmweb.exe', however attachments fail, i changed the servlet address within the repository to reflect DNS (https://support.company.com:443/CAisd/UploadServlet) but attachments still fails.
Any advice please