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[GH-ISSUE #2057] Loggin in with Pangolin CLI gives lots of Failed to forward handshake initiation... : write: destination address required errors #29891

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opened 2026-06-13 10:09:37 -05:00 by GiteaMirror · 4 comments
GiteaMirror commented 2026-06-13 10:09:37 -05:00
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Originally created by @hcwinsemius on GitHub (Dec 12, 2025).
Original GitHub issue: https://github.com/fosrl/pangolin/issues/2057

Describe the Bug

First, I love pangolin!

Second, I updated today from 1.9.4 to 1.13. I also updated all other dependencies as instructed. Looking at the server logs, once I log in with a machine client with olm, or pangolin CLI, I receive MANY of the messages as below. I have also done a complete install in a separate environment, made one site, made one pangolin CLI login and tested again. I do not see this issue in this case. I have checked and have not seen any BUG report so far that addresses this.

gerbil    | ERROR: YYYY/MM/DD HH:MM:SS Failed to forward handshake initiation: write udp 100.89.128.1:42209->100.89.128.48:51841: write: destination address required

The first IP address is always 100.89.128.1, the second moves around the subnet 100.89.128.0, the last number is changing 24, 36, 40, 48. Port number varies widely.

I can however login to devices, resources, private and public. So from the outside everything seems to work.

Environment

  • OS Type & Version: (e.g., Ubuntu 22.04): Ubuntu 24.04
  • Pangolin Version: 1.13.0
  • Gerbil Version: 1.3.0
  • Traefik Version: v3.6
  • Newt Version: 1.7.0
  • Olm Version: (if applicable) 1.2.0

To Reproduce

  • make sure there are a bunch of sites and resources, including private resources
  • Upgrade server from 1.9.4 to 1.13
  • Login with pangolin CLI
    As soon as I login, the ERROR messages start to appear. When I logout, they stop.

Expected Behavior

No ERROR messages in server.

Originally created by @hcwinsemius on GitHub (Dec 12, 2025). Original GitHub issue: https://github.com/fosrl/pangolin/issues/2057 ### Describe the Bug First, I love pangolin! Second, I updated today from 1.9.4 to 1.13. I also updated all other dependencies as instructed. Looking at the server logs, once I log in with a machine client with olm, or pangolin CLI, I receive MANY of the messages as below. I have also done a complete install in a separate environment, made one site, made one pangolin CLI login and tested again. I do not see this issue in this case. I have checked and have not seen any BUG report so far that addresses this. ``` gerbil | ERROR: YYYY/MM/DD HH:MM:SS Failed to forward handshake initiation: write udp 100.89.128.1:42209->100.89.128.48:51841: write: destination address required ``` The first IP address is always 100.89.128.1, the second moves around the subnet 100.89.128.0, the last number is changing 24, 36, 40, 48. Port number varies widely. I can however login to devices, resources, private and public. So from the outside everything seems to work. ### Environment - OS Type & Version: (e.g., Ubuntu 22.04): Ubuntu 24.04 - Pangolin Version: 1.13.0 - Gerbil Version: 1.3.0 - Traefik Version: v3.6 - Newt Version: 1.7.0 - Olm Version: (if applicable) 1.2.0 ### To Reproduce - make sure there are a bunch of sites and resources, including private resources - Upgrade server from 1.9.4 to 1.13 - Login with pangolin CLI As soon as I login, the `ERROR` messages start to appear. When I logout, they stop. ### Expected Behavior No `ERROR` messages in server.
GiteaMirror commented 2026-06-13 10:09:41 -05:00
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@oschwartz10612 commented on GitHub (Dec 12, 2025):

Hi! Thanks for trying the new feature!

So just so I understand correctly: you are seeing the log message print
a lot but you are still able to connect to resources just fine using olm
or the desktop clients?

<!-- gh-comment-id:3647953981 --> @oschwartz10612 commented on GitHub (Dec 12, 2025): Hi! Thanks for trying the new feature! So just so I understand correctly: you are seeing the log message print a lot but you are still able to connect to resources just fine using olm or the desktop clients?
GiteaMirror commented 2026-06-13 10:09:43 -05:00
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@hcwinsemius commented on GitHub (Dec 12, 2025):

Yes! To clarify a bit more. I have a large number of field devices that communicate with a 4g modem and sim card. These log in with newt (1.7.0). On my desktop I then want to connect via ssh or vnc. I did this with olm before. I now use the new pangolin cli. Works fine as you say but I do see multiple of these ERROR messages come up each second.

Thanks for the hard work! Pangolin gives exactly what I need for these field devices.

<!-- gh-comment-id:3648151360 --> @hcwinsemius commented on GitHub (Dec 12, 2025): Yes! To clarify a bit more. I have a large number of field devices that communicate with a 4g modem and sim card. These log in with newt (1.7.0). On my desktop I then want to connect via ssh or vnc. I did this with olm before. I now use the new pangolin cli. Works fine as you say but I do see multiple of these ERROR messages come up each second. Thanks for the hard work! Pangolin gives exactly what I need for these field devices.
GiteaMirror commented 2026-06-13 10:09:45 -05:00
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@oschwartz10612 commented on GitHub (Dec 12, 2025):

Okay. I think this might be fine then. I think what is maybe happening
is some of the field devices are not responding to the Wireguard
messages and are generating that error.

I quieted up that error in the logs so it is not throwing a bunch of
errors for the next release. 5414d21dcd838df26e246204ca031626ad5ce7ce

<!-- gh-comment-id:3648522618 --> @oschwartz10612 commented on GitHub (Dec 12, 2025): Okay. I think this might be fine then. I think what is maybe happening is some of the field devices are not responding to the Wireguard messages and are generating that error. I quieted up that error in the logs so it is not throwing a bunch of errors for the next release. 5414d21dcd838df26e246204ca031626ad5ce7ce
GiteaMirror commented 2026-06-13 10:09:47 -05:00
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@hcwinsemius commented on GitHub (Dec 13, 2025):

Thanks for the response. I had that feeling also. These devices are indeed also offline for most of the time. They are configured in a power cycle circuit to switch on once every 15 or 30 minutes, do a task and then switch off after about 5 minutes. So they are quiet for more than 80% of the time. Thanks for checking out. If there is anything I could do for you to test this further let me know.

<!-- gh-comment-id:3649206431 --> @hcwinsemius commented on GitHub (Dec 13, 2025): Thanks for the response. I had that feeling also. These devices are indeed also offline for most of the time. They are configured in a power cycle circuit to switch on once every 15 or 30 minutes, do a task and then switch off after about 5 minutes. So they are quiet for more than 80% of the time. Thanks for checking out. If there is anything I could do for you to test this further let me know.
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Reference: github-starred/pangolin#29891
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