# A serious error occurred in Duplicati 2.0.4.23-1

**URL:** <https://forum.duplicati.com/t/a-serious-error-occurred-in-duplicati-2-0-4-23-1/8243>\
**Category:** Support\
**Created:** [October 14, 2019, 10:48am UTC](https://forum.duplicati.com/t/a-serious-error-occurred-in-duplicati-2-0-4-23-1/8243 "2019-10-14T10:48:52Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![ts678](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/t/8491ac/32.png) [@ts678](https://forum.duplicati.com/u/ts678)\
**Post date:** [November 7, 2019, 5:26pm UTC](https://forum.duplicati.com/t/a-serious-error-occurred-in-duplicati-2-0-4-23-1/8243/16 "2019-11-07T17:26:45Z")

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> [@wyrkos](#):
>
> nothing is changed.

If this means you still have the errors shown [earlier](https://forum.duplicati.com/t/a-serious-error-occurred-in-duplicati-2-0-4-23-1/8243/13), then it still looks like you have a network issue.

> [@Backups suddenly failing - 4 machines now](https://forum.duplicati.com/t/backups-suddenly-failing-4-machines-now/5379/13):
>
> > I’m not sure about the “channel is retired” ones
> 
> That is unfortunately a “follow error” that happens when something else breaks.

and the other two specifically say “Unable to write data to the transport connection”. I can’t see the timing relationship from the post, but you can see if you get transport errors before “retired” errors.

Have you tried standard network diagnostics, such as restarting all your equipment, including your computer, routers, and modems, testing upload and download speed/reliability with something else, running an Internet speed test, running a `ping` test to some locations, getting ISP help, and so on?

If you can do network analysis, you probably have (or could install) diagnostic tools like tcpdump or Wireshark. Duplicati has little control of low-level TCP protocol. It’s Amazon code and your Ubuntu.

Raising [–number-of-retries](https://duplicati.readthedocs.io/en/latest/06-advanced-options/#number-of-retries) can sometimes go through bad networks, but sometimes it’s impossible.

Live log at About → Show log → Retry can show whether you’re actually getting retries on upload.

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