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[GH-ISSUE #399] Bug Report: Errors 'invalid start byte' when running scripts #2190

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opened 2026-03-14 02:56:06 +03:00 by kerem · 5 comments

kerem commented

2026-03-14 02:56:06 +03:00

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Originally created by @alexandremottier on GitHub (Apr 16, 2021).
Original GitHub issue: https://github.com/amidaware/tacticalrmm/issues/399

Originally assigned to: @wh1te909 on GitHub.

Server Info (please complete the following information):

OS: Debian 10
Browser: Firefox 86
RMM Version (as shown in top left of web UI): v.0.6.0

Installation Method:

Standard
Docker

Agent Info (please complete the following information):

Agent version (as shown in the 'Summary' tab of the agent from web UI): v1.5.0
Agent OS: Windows 10 Pro, 64 bit (build 18363.1441)

Describe the bug
Python (?) error when running a command on a workstation from TacticalRMM.
Error : 'utf-8' codec can't decode byte 0xff in position 11: invalid start byte

To Reproduce
Steps to reproduce the behavior:

Right click on the Windows 10 workstation in workstations list
Choose "Run script"
Choose "Send command"
Shell : CMD. Timeout : 30 seconds. Command arp -a

Expected behavior
Getting the network addresses from machines of the network with MAC address.

Screenshots

Additional context
Same problem when I am using a homemade script with the same command :

Originally created by @alexandremottier on GitHub (Apr 16, 2021). Original GitHub issue: https://github.com/amidaware/tacticalrmm/issues/399 Originally assigned to: @wh1te909 on GitHub. **Server Info (please complete the following information):** - OS: Debian 10 - Browser: Firefox 86 - RMM Version (as shown in top left of web UI): v.0.6.0 **Installation Method:** - [X] Standard - [ ] Docker **Agent Info (please complete the following information):** - Agent version (as shown in the 'Summary' tab of the agent from web UI): v1.5.0 - Agent OS: Windows 10 Pro, 64 bit (build 18363.1441) **Describe the bug** Python (?) error when running a command on a workstation from TacticalRMM. Error : `'utf-8' codec can't decode byte 0xff in position 11: invalid start byte` **To Reproduce** Steps to reproduce the behavior: 1. Right click on the Windows 10 workstation in workstations list 2. Choose "Run script" 3. Choose "Send command" 4. Shell : CMD. Timeout : 30 seconds. Command `arp -a` **Expected behavior** Getting the network addresses from machines of the network with MAC address. **Screenshots** <img width="687" alt="image" src="https://user-images.githubusercontent.com/40338703/115039856-1efa3680-9ed1-11eb-9eb4-98574779351c.png"> **Additional context** Same problem when I am using a homemade script with the same command : <img width="984" alt="image" src="https://user-images.githubusercontent.com/40338703/115040153-6a144980-9ed1-11eb-8081-3061e69d8d5e.png"> <img width="995" alt="image" src="https://user-images.githubusercontent.com/40338703/115040232-80baa080-9ed1-11eb-9461-338c88c4e09e.png">

kerem

2026-03-14 02:56:06 +03:00

closed this issue
added the
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kerem commented

2026-03-14 02:56:23 +03:00

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@wh1te909 commented on GitHub (Apr 17, 2021):

thanks, am aware of this issue actually ran into it myself recently when running the tree command. working on a fix.

@wh1te909 commented on GitHub (Apr 17, 2021): thanks, am aware of this issue actually ran into it myself recently when running the `tree` command. working on a fix.

kerem commented

2026-03-14 02:56:28 +03:00

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@alexandremottier commented on GitHub (Apr 17, 2021):

Thanks a lot for your quick answer. After some tests, I think that the problem is related to all CMD commands.
PowerShell commands are working just fine.

Thanks a lot for your job, your app is very nice !
I think you will be a strong competitor to the market leaders.
The Alpha version of your application is already very complete and functional from what I could test.

@alexandremottier commented on GitHub (Apr 17, 2021): Thanks a lot for your quick answer. After some tests, I think that the problem is related to all CMD commands. PowerShell commands are working just fine. Thanks a lot for your job, your app is very nice ! I think you will be a strong competitor to the market leaders. The Alpha version of your application is already very complete and functional from what I could test.

kerem commented

2026-03-14 02:56:33 +03:00

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Owner

@wh1te909 commented on GitHub (Apr 21, 2021):

I've fixed this (requires an agent update) will be in the next release

@wh1te909 commented on GitHub (Apr 21, 2021): I've fixed this (requires an agent update) will be in the next release

kerem commented

2026-03-14 02:56:38 +03:00

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Owner

@alexandremottier commented on GitHub (Apr 21, 2021):

FYI, I have tested with TacticalRMM v0.6.1 and agent in v1.5.1 and I had the same issue.
I am waiting for TacticalRMM v0.6.2 ;-)

Thanks for your quick answer :-)

@alexandremottier commented on GitHub (Apr 21, 2021): FYI, I have tested with TacticalRMM v0.6.1 and agent in v1.5.1 and I had the same issue. I am waiting for TacticalRMM v0.6.2 ;-) Thanks for your quick answer :-)

kerem commented

2026-03-14 02:56:43 +03:00

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Owner

@wh1te909 commented on GitHub (Apr 23, 2021):

Released in 0.6.2
You'll need to upgrade to 0.6.2 and then wait for your agents to update to 1.5.2

@wh1te909 commented on GitHub (Apr 23, 2021): Released in 0.6.2 You'll need to upgrade to 0.6.2 and then wait for your agents to update to 1.5.2

kerem referenced this issue

2026-03-14 07:04:24 +03:00

[GH-ISSUE #2190] 403 errors after update - can't take control #3300