Cannot clone using Backlog's GIt function

[岡本優貴]

Currently, using Backlog's Git function, I am trying to link it to a version control tool called Sourcetree. For the first and second times, I was able to connect using the URL in Backlog's Git function, but Connection cannot be established due to the following error condition.

コマンド: git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks ls-remote https://ptcs.backlog.jp/git/RPA_OPERATION/test.git
出力:
エラー: fatal: unable to access 'https://ptcs.backlog.jp/git/RPA_OPERATION/test.git/': Failed to connect to ptcs.backlog.jp port 443 after 152186 ms: Couldn't connect to server

There is a possibility that the internal environment is preventing connection, but I am unable to resolve the issue.

[Peter_DevSamurai]

This error seems related to connectivity issues when trying to link Backlog's Git function to Sourcetree. The error message suggests that the connection to the server at `ptcs.backlog.jp` on port `443` (HTTPS) could not be established after several attempts. Here are a few suggestions that might help in resolving the issue: 

1. **Check Network Connection and Firewall**
- Ensure that there are no network issues on your end preventing the connection.
- Check whether any firewall or security software is blocking Sourcetree from accessing the internet, especially on port 443.

2. **Verify the Repository URL**
- Verify if the URL `https://ptcs.backlog.jp/git/RPA_OPERATION/test.git` is correct and accessible via a web browser or another Git client.

3. **Use SSH instead of HTTPS**
- If possible, try to use an SSH connection instead of HTTPS, which might bypass the connection issues.

4. **Proxy Settings**
- If you are behind a proxy, ensure that Sourcetree is configured to use the correct proxy settings.

5. **Update Sourcetree**
- If you are using an outdated version of Sourcetree, consider updating to the latest version, as it might have fixes for connectivity issues.

6. **Contact Your Network Administrator**
- There might be network policies or firewalls within your internal environment that block the connection to the specified URL/port, check with your network administrator or IT department for any restrictions.

7. **Check with Backlog Support**
- If the issue persists, it might be worth reaching out to Backlog Support to check if there are any issues or restrictions on their end.

9. **Check DNS Settings**
- Sometimes, DNS resolution issues can cause connectivity problems. Make sure the DNS settings are correct and try to use a public DNS server like Google's (8.8.8.8) to see if it resolves the issue. 

10. **Validate SSL/TLS Configurations**
- Misconfigurations in SSL/TLS can also lead to connection failures. Validate whether the SSL certificates and configurations on both the client and server sides are correct.

11. **Test with Command Line Git**
- Try to connect to the repository using command line Git to see if the issue is specific to Sourcetree or a broader connectivity issue. Remember to replace sensitive information in error messages with placeholders before sharing them online or with third parties, to maintain privacy and security.