Solving Google Scholar Access Block

If you are still struggling with Google Scholar “Bot Verification” (Captcha) on your VPS, the 2018 method of manually editing /etc/hosts has become obsolete. The most reliable and low-maintenance solution today is leveraging Cloudflare WARP.

The Logic

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By installing the WARP client, you provide your VPS with a clean, high-reputation outbound IP address (dual-stack). Combined with modern routing tools like Xray or Sing-box, you can selectively route academic traffic through the WARP tunnel.

1. Install WARP Client Use the official Cloudflare repository for stability:

   curl -fsSL https://pkg.cloudflareclient.com/pubkey.gpg | gpg --yes --dearmor --output /usr/share/keyrings/cloudflare-warp-archive-keyring.gpg
   echo "deb [signed-by=/usr/share/keyrings/cloudflare-warp-archive-keyring.gpg] https://pkg.cloudflareclient.com/ focal main" | tee /etc/apt/sources.list.d/cloudflare-client.list
   apt update && apt install cloudflare-warp

2. Configure Split Routing (e.g., Sing-box) Force scholar.google.com traffic to use the WARP outbound, prioritizing IPv6 where available.

   {
     "outbounds": [
       { "type": "wireguard", "tag": "warp-out", ... }
     ],
     "route": {
       "rules": [
         {
           "domain_suffix": [ "scholar.google.com", "scholar.google.com.hk" ],
           "outbound": "warp-out"
         }
       ]
     }
   }

Why this works?

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• Zero Maintenance: No need to manually update IPv6 addresses when Google’s CDN nodes rotate.
• High Reputation: WARP’s IP ranges are generally considered “clean” by Google, significantly reducing Captcha frequency.

Legacy Version (Just For Reference)

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Google Scholar blocked most of DigitalOcean VPS IP(IPv4), so you should use IPv6 to access Google Scholar instead.

via: https://github.com/shadowsocks/shadowsocks-libev/issues/113

OS: Ubuntu 16.04.3 LTS ss version: shadowsocks-libev 3.1.3

• Configure shadowsocks-libev Edit /etc/default/shadowsocks-libev:

# add '-6' to resolve hostname to IPv6 address first
DAEMON_ARGS="-u -6" 

• Enable IPv6 in config Edit /etc/shadowsocks-libev/config.json:

"dns_ipv6": true

• Manual DNS Override Edit /etc/hosts:

## Scholar
## type 'host google.com' to get the correct ipv6 address
2607:f8b0:4005:804::200e scholar.google.com
2607:f8b0:4005:804::200e scholar.l.google.com

• systemctl restart shadowsocks-libev