A client received the following error while trying to login to a Team Approach database via Citrix
ORA - 12203 TNS unable to connect to destination
If a single user is affected, make sure their password does not contain the "@" sign.
If multiple users are affected, contact support. Please include which Citrix server you are connected to. Here is how you can find out which Citrix server you are on: https://kb.blackbaud.com/articles/Article/65808