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When you invoke a workflow that requires a remote connection (for example, to a server), you need to define this connection in the default.runtimeConfig file.
Please, take a look on this guide which describes how to configure the URL under the contributedconfigs flag.
Please note, by default, this section is commented out. Thus, you will need to uncomment it first.
If you have concerns regarding storing the password in the unencrypted form, please, refer to this guide. It describes how to encrypt the password in DQC.