Cannot connect to MongoDB server da1.eecs.utk.edu:27017 (i/o timeout)

[SamaraSilvia81]

Hello World of Code Team,

Thank you for maintaining this valuable public dataset.

I am a graduate student (M.Sc. student at CIN-UFPE, Brazil) attempting to query the WoC database, following the methodology of the MSR 2024 paper "A Dataset of Microservices-based Open-Source Projects".

I noticed your "Major updates in Sep, 2025" note, which states: "all servers are now on rhel9: please report problems".

I believe I have encountered a connection problem that may be related to this migration. I am unable to connect to the public MongoDB host da1.eecs.utk.edu on port 27017.

1. Command Attempted

I am running the following mongoexport command from Windows cmd.exe:
mongoexport --host "da1.eecs.utk.edu" --db=WoC --collection=P_metadata.U --query="{\"$and\": [{\"LatestCommitDate\":{\"$gte\": 1697587200}},{\"LatestCommitDate\": {\"$lte\": 1729209600}},{\"CommunitySize\":{\"$gte\": 3}},{\"NumCommits\":{\"$gte\":100}} ]}" --out="C:\Users\Samara\OneDrive\Documentos\Mestrado\Dataset\P.U.json" --type=json

2. Error Received

The command consistently fails with a server selection timeout. This is the error message:
2025-10-18T23:46:55.168-0300 failed to connect to mongodb://da1.eecs.utk.edu/: server selection error: server selection timeout, current topology: { Type: Single, Servers: [{ Addr: da1.eecs.utk.edu:27017, Type: Unknown, Last error: dial tcp 160.36.59.133:27017: i/o timeout }, ] }

3. Diagnostic Test

To confirm the issue, I ran a Test-NetConnection from Windows PowerShell. The test shows that the server (da1.eecs.utk.edu) is online and responding to pings, but the specific TCP connection to port 27017 is failing.

• ComputerName : da1.eecs.utk.edu
• RemotePort : 27017
• PingSucceeded : True
• TcpTestSucceeded : False

This suggests the MongoDB service on that port may be down or firewalled after the rhel9 migration.

Thank you for looking into this. Please let me know if you need any further diagnostic information.