Hi Xu-Dong,
The error means that the connection between the two endpoints couldn't be established successfully.
Since you're using Globus Connect Personal, we know the direction of the connection must have been
Globus Connect Personal ---> Other Endpoint
It's saying that the two endpoints agreed to use port 50004 for data transfer, but the other endpoint didn't respond to the connection attempt.
There isn't really much more explanation than that available to us from the error.
We often see traffic blocked by firewall rules, so you may want to contact your network administrators if these endpoints are new, to ensure that the traffic is allowed.
(On a typical home network, you do not need to setup any special configuration to support Globus Connect Personal.)
Another easy explanation is that the other endpoint might be experiencing connectivity issues or other failures, in which case those would need to be resolved by its owner.
A few things you can try right off the bat:
- Do a transfer between your Globus Connect Personal endpoint and the Globus Tutorial Endpoints
Search for "Globus Tutorial" to find this. This lets you easily make sure your endpoint is working properly.
- If there are network constraints, make sure you are connected in a way that will let you reach the other endpoint
For example, if the other endpoint is on an intranet or behind a VPN, make sure you are connected.
- Contact the owner of the other endpoint to ask about the issue
Endpoints might have network issues, scheduled or unplanned maintenance, or any other of a wide variety of things that make servers fail.
It might be best to reach out proactively, to make sure it's not a known failure which someone is working on (and to alert the owner if there is an issue).
We're careful to avoid sharing too many details about particular endpoints and tasks on the public mailing lists.
If you file a support ticket by contacting us at our support email, we're often better able to help you dig through specifics of a failure.
I hope that helps as a starting point, at least.
Best,
-Stephen