We link JIRA issues with Agile software (it's a Product Life cycle Management tool), i.e. with ECO/MCO (Engineering Change Order, Manufacturing Change Order).
Recently Agile changed it's address (They moved to another server). All links stopped working. Is it possible to change links in JIRA?
If I understand, correctly, when you say Link you are talking about the Link issue feature. That being the case, there is no easy way for you to change all these links in one go.
An idea I would go with is using the import/export CSV tool to do this. You could export all the issues with links to a CSV, modify the link URLs in one go with a simple find-replace tool, and re-import.
To use the import/export tool to batch edit issues, you can follow the steps presented in the following thread by Sam Hall: https://community.atlassian.com/t5/Jira-questions/Updating-status-with-a-CSV-file/qaq-p/62664
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