为什么没有使用git协议来克隆项目的响应？

Question

I try to clone a Linux branch from git://git.kernel.org to local machine:

# git clone git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux -b perf/core
Cloning into 'linux'...

But there is no response. Use the tcpdump and Wireshark to check the captured packets:
We can see the TCP connection was established. But after client sent request using git smart protocol , there was no any response.

Could anyone give some clues?

Update:
(1) According to @MariaInesParnisari suggestion, using --verbose flag, but it doesn't show more information:

# git clone git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux -b perf/core --verbose
Cloning into 'linux'...
Looking up git.kernel.org ... done.
Connecting to git.kernel.org (port 9418) ... 147.75.110.187 done.

(2) Change to https protocol, it worked:

# git clone https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux -b perf/core --verbose
Cloning into 'linux'...
POST git-upload-pack (gzip 25015 to 12570 bytes)
remote: Counting objects: 5287534, done.
remote: Compressing objects: 100% (807310/807310), done.

Answer 1

I never managed to clone from work using the git protocol: it uses the special port 9418, which is always blocked.

Only https is working/allowed, git and ssh are usually blocked (for outbound connections, since ssh is allowed for servers within the intranet)