How to traceroute on a tcp port Cody Selzer August 15, 2020 00:57 Updated Follow You can use traceroute to find networking issues on a specific tcp port. For example: traceroute -T -p 25 smtp.gmail.com Related articles How do I know if an IP address is internal or public? How-To change an account's IP address How do I change my Exim SMTP port from 25? PHP Website Loads Incorrectly How can I change the group of a linux user? Comments 0 comments Article is closed for comments.