git hangs on push

Question

I cannot push to github. I was able to push little changes, but this time, it hangs after it writes this:

git push origin master
Counting objects: 22, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (12/12), done.
Writing objects: 100% (12/12), 1.51 KiB, done.
Total 12 (delta 8), reused 0 (delta 0)

On my Ubuntu Process Manager, I saw that ssh hangs when I try to push something and it is: ssh [email protected] git-receive-pack 'xxx/yyy.git'

When I try to directly run this command on my terminal, now it hangs after it writes this:

0078...7d4 refs/heads/master report-status delete-refs side-band-64k quiet ofs-delta
0000

All the other thins work well, but I can't push. What could be the reason?

Additional information: I re-created the git file and changed the remote to HTTP from SSH. Now I get this error when I try to push:

Counting objects: 17, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (9/9), done.
Writing objects: 100% (9/9), 1.19 KiB, done.
Total 9 (delta 6), reused 0 (delta 0)
error: RPC failed; result=52, HTTP code = 0
fatal: The remote end hung up unexpectedly
fatal: The remote end hung up unexpectedly
Everything up-to-date

Extra information 2: I've been tested it for hours and it looks like my network connection is the problem. I tried to push from another connection, and it worked very well. What could be the reason behind this? The modem's firewall is disabled, by the way.

Answer 1

I've spent the last 5 hours trying to fix a similar problem. First, are you running this over a tunnel or VPN connection?

Turns out that the MTU (Maximum Transmission Unit) of a tunnel can be misconfigured in that some router in the middle of the network path can only support a lower MTU but this isn't known to the VPN/tunnel software, resulting in dropped packets.

So the quick answer is to try to lower the MTU of your connection:

sudo ifconfig eth0 mtu 1300

Here I'm setting the MTU for the eth0 interface, replace with the interface you're actually using to access the git server. The default MTU is usually 1500.

For OpenVPN I had to update the tun0 interface. There is a better/more robust way to do this in the OpenVPN configuration: use the link-mtu <n> and mssfix options.

Answer 2

In my case issue was related with access rights to repository. I had read only access, after adding rights to write, issue was solved.