On Wed, 19 Mar 2025 11:19:13 -0700 Andy Tai <a...@atai.org> wrote: > when I do guix pull, I run into this error: > > guix substitute: error: TLS error in procedure > 'write_to_session_record_port': Error in the push function.
As far as I understand, this error message indicates a network issue resulting in a connection failure. It is not possible to deduce the cause of such failure from this message along. On Wed, 19 Mar 2025 12:05:48 -0700 Andy Tai <a...@atai.org> wrote: > More context: I am not on any VPN or such, if this detail may be of > value for the problem at hand. > > On Wed, Mar 19, 2025 at 11:58 AM Andy Tai <a...@atai.org> wrote: > > > > Yes, the relevant message commenting on the MTU size was > > > > https://issues.guix.gnu.org/71238#7 I am not particularly knowledgeable in the topic. I was forced to investigate it when using the tunnel. However, the same issue with MTU might happen without a tunnel as well. Some router in the route may have a lower MTU set for some reason. To identify whether MTU was an issue, I tested manually by pinging the address with packets of different sizes. I do not know whether there is a better way to do that. I described that in the linked post. "MSS clamping" is a technique to probe and adjust the size of MTU automatically. However, I didn't look into it aside of configuring a tunnel. I suspect that it may be possible to set it up somehow for ordinary connections. But I do not know. Roman
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