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Slow SSH clone/pull/push

Xerillio

For a few months now I think, whenever I'm pushing/pulling/cloning (or i guess doing other network related GIT operations) it takes forever before anything actually seems to happen. That is, it takes around 1 minute before it starts fulfilling the task.

I'm using GIT through "Bash on Ubuntu on Windows" and if I clone using HTTPS there's no problem, however, with SSH it takes too long before it starts. I have tested both HTTPS and SSH for Bitbucket and GitHub and it only seems to be SSH for Bitbucket that is slow.

Example: cloning a repo of less than 2MB takes around 1m10s, while only in the last second the files are actually written to the disk.

I don't know if this could have anything to do with the relatively recent update to the Bitbucket IPs, but deleting my "known_hosts" in ~/.ssh didn't not help either. Is this a known issue? Common GIT tasks are becoming quite cumbersome.

Accepted answers

giridharkannan

After breaking my head for a day, have figured out the root cause of the issue.

SSH supports both IPv4 and IPv6 and prefers IPv6 if the DNS retrieves AAAA record, but my ISP doesn't support IPv6, which results in huge delays

We can solve it in two ways

Filter out AAAA replies so that we are left with IPv4 address (too much work)
Set "AddressFamily inet" in /etc/ssh/ssh_config to force IPv4 connection

After changing ssh_config do restart ssh client, on Ubuntu the command is

"sudo service ssh restart"

All comments

Ana Retamal

Hi Casper! Are you still experiencing this issue? Did you have a chance to try a different network?

Let us know!

Ana

Xerillio

Hey Ana

Thanks for the suggestion. Apparently there must be something to it. At work I had no problems and turning on VPN from home also helped... question is why

Could it be my router or ISP that is somehow filtering that connection? Although I don't see why I would have no trouble with GitHub then...

Xerillio

Hmm, installing Wireshark I can see that it must be something inside bash/git itself, because no packets are captured until after a minute of silence. SSH'ing against GitHub instantly shows packets being transferred however.

Perhaps I should reinstall git or maybe even bash if there's no other way

giridharkannan

After breaking my head for a day, have figured out the root cause of the issue.

SSH supports both IPv4 and IPv6 and prefers IPv6 if the DNS retrieves AAAA record, but my ISP doesn't support IPv6, which results in huge delays

We can solve it in two ways

Filter out AAAA replies so that we are left with IPv4 address (too much work)
Set "AddressFamily inet" in /etc/ssh/ssh_config to force IPv4 connection

After changing ssh_config do restart ssh client, on Ubuntu the command is

"sudo service ssh restart"

Xerillio

Amazing, that seems to have done it. Thanks a lot for the suggestion.

luisgmail

This was my exact problem, perhaps Movistar Perú doesn't support IPv6 either.

Not surprised.

Thank you!

midboh

My problem too. I had been copping 15 minute delays.

Massive thanks.

Ben_3u2vx7

same problem here, any suggestion to that?

First time I experience something like that.

Screenshot 2019-11-02 at 15.54.30.png

Xerillio

Can you describe your issue in more details? It seems to me that your issue is more about slow download speed, which seems slightly different.

Did you try the solution giridharkannan posted?

Have you checked if there's a general issue with your download speed (not just in GIT)?

Csonger Fagyal

Same problem here (Hungary).

I get ~30KiB/s with git clone via ssh.

Both on IPv4 and IPv6.

Other git providers are about 100x faster on the same network.

Ashok Rabadiya

Same problem here

Gnanajeyam95

Navigate to this folder C:\Users\<username>\.ssh

Create new config file if it not presented.

To create a new config file.

Open git bash from the folder and enter below command.

touch config

Once you created the file, open the file and add the below text.

AddressFamily inet

Save it and close the file.

Reload the terminal and try here. It will work

atrandafir

ty mate, this worked for me

kvaitulys

this worked for me. thanks

Sameera Kumarasingha

thanks, on windows 11

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