I am working on getting validation from our Infosec team on JIRA integration with Team city. I will need to understand the type of authentication that is used between the two systems and the above mentioned diagram for them to understand how data flows between the two applications and any additional collateral you could provide.
I believe I answered a similar post for you, JIRA to Bitbucket Implementation diagram , and similar to that question OAuth is the recommended authentication method. With that said, you have the option of integrating in-house with a custom-built integration using OAuth 2.0 (3LO) apps or you may use an Atlassian Marketplace integration. Here is a preset search for Atlassian Marketplace | TeamCity apps .
A note about 3rd party application integrations:
I hope this information proves helpful.
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