3：【GitHub连接】Connection timed out port 22 → 改用443端口SSH（公司/校园网2026常见）

# 创建~/.ssh/config文件
New-Item -ItemType File -Path "$env:USERPROFILE\.ssh\config" -Force

# 编辑文件内容
@"
Host github.com
  HostName ssh.github.com
  Port 443
  User git
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes
"@ | Out-File -FilePath "$env:USERPROFILE\.ssh\config" -Force

# 创建或编辑~/.ssh/config文件
cat > ~/.ssh/config << 'EOF'
Host github.com
  HostName ssh.github.com
  Port 443
  User git
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes
EOF

# 检查SSH密钥是否存在
ls -la ~/.ssh/

# 如果不存在，生成密钥
ssh-keygen -t ed25519 -C "your_email@example.com"

# 添加密钥到ssh-agent
eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519

# 查看公钥
cat ~/.ssh/id_ed25519.pub

# 测试443端口SSH连接
ssh -T -p 443 git@ssh.github.com

# 预期输出
# Hi username! You've successfully authenticated, but GitHub does not provide shell access.

# 测试常规SSH连接（端口22）
ssh -T git@github.com

# 查看当前远程URL
git remote -v

# 如果使用HTTPS，切换到SSH
# git remote set-url origin git@github.com:username/repo.git

# 测试推送
touch test.txt
git add test.txt
git commit -m "test"
git push

# 标准SSH配置（端口22）
Host github.com
  HostName github.com
  Port 22
  User git
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes
  
# 443端口配置（备用）
Host github.com-443
  HostName ssh.github.com
  Port 443
  User git
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes

#!/bin/bash

# 测试端口22连接
echo "测试端口22连接..."
if ssh -T -o ConnectTimeout=5 git@github.com > /dev/null 2>&1; then
    echo "端口22可用，使用标准SSH配置"
    git remote set-url origin git@github.com:username/repo.git
else
    echo "端口22不可用，切换到443端口"
    git remote set-url origin git@github.com-443:username/repo.git
fi

# 验证连接
echo "验证连接..."
git ls-remote

# 测试443端口是否开放
nc -zv ssh.github.com 443

# 检查SSH配置
cat ~/.ssh/config

# 详细连接测试
ssh -v -T -p 443 git@ssh.github.com

# 检查配置文件权限
chmod 600 ~/.ssh/config
chmod 700 ~/.ssh

# 清除SSH缓存
ssh-keygen -R ssh.github.com
ssh-keygen -R github.com

# 重新测试
ssh -T -p 443 git@ssh.github.com

# 多账户SSH配置
cat > ~/.ssh/config << 'EOF'
# 个人账户
Host github.com-personal
  HostName ssh.github.com
  Port 443
  User git
  IdentityFile ~/.ssh/id_ed25519_personal
  IdentitiesOnly yes

# 工作账户
Host github.com-work
  HostName ssh.github.com
  Port 443
  User git
  IdentityFile ~/.ssh/id_ed25519_work
  IdentitiesOnly yes
EOF

#!/bin/bash

# 网络环境检测脚本

echo "=== 网络环境检测 ==="

# 测试端口22
echo "测试端口22..."
if ssh -T -o ConnectTimeout=3 git@github.com > /dev/null 2>&1; then
    echo "✓ 端口22可用"
    PORT=22
    HOST=github.com
else
    echo "✗ 端口22不可用"
    # 测试端口443
    echo "测试端口443..."
    if ssh -T -o ConnectTimeout=3 -p 443 git@ssh.github.com > /dev/null 2>&1; then
        echo "✓ 端口443可用"
        PORT=443
        HOST=ssh.github.com
    else
        echo "✗ 端口443不可用"
        echo "请检查网络连接"
        exit 1
    fi
fi

echo "推荐配置："
echo "Host github.com"
echo "  HostName $HOST"
echo "  Port $PORT"
echo "  User git"
echo "  IdentityFile ~/.ssh/id_ed25519"
echo "  IdentitiesOnly yes"

Host *
  # 连接复用
  ControlMaster auto
  ControlPath ~/.ssh/sockets/%r@%h-%p
  ControlPersist 600
  
  # 压缩
  Compression yes
  
  # 超时设置
  ServerAliveInterval 30
  ServerAliveCountMax 10
  
  # 密钥交换优化
  KexAlgorithms curve25519-sha256@libssh.org
  
  # 加密算法
  Ciphers chacha20-poly1305@openssh.com,aes256-gcm@openssh.com