Tidb-server 4000 port connection timed out, changed to port 25 and passed the check, but SSH startup reported an error

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This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: Tidb-server 4000端口连接超时，改了25端口检查能过，但是启动ssh报错

| username: TiDBer_kChzvwMn

dial tcp xxxxx:25: connect: connection refused

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| username: 裤衩儿飞上天 | Original post link

Check the firewall.

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| username: TiDBer_kChzvwMn | Original post link

I have deployed all nodes on a single machine, and I have also checked the firewall, but I still get this error.

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| username: tidb菜鸟一只 | Original post link

I don’t understand…

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| username: Billmay表妹 | Original post link

【TiDB Usage Environment】Production Environment / Testing / PoC
【TiDB Version】
【Reproduction Path】What operations were performed that led to the issue
【Encountered Issue: Problem Symptoms and Impact】
【Resource Configuration】
【Attachments: Screenshots / Logs / Monitoring】

Please describe the issue according to the requirements~

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| username: ffeenn | Original post link

It’s still a firewall issue, didn’t check carefully, both on the server and outside the server.

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| username: Kongdom | Original post link

A simple verification method: turn off the firewall and try again, also turn off the firewall on the single machine and try again.

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| username: liuis | Original post link

This error feels like a firewall issue.