Hi, I have an issue with our unviersal Robot, some times, the robot stop, and an error message show up “No controller”. It happens with an UR 5 e-series, UR 5 CB series and also with one UR 10. The robots are all up to date, equiped with On robot RG6 gripper with the UR-caps. This error happens w…

@r4p , @anon99292792 , @tal , @ad1 , @Ebbe We have found solution for python server, and probably also for C++ http server. There was a configuration issue in our examples where python server was closing connection after each request. If program (or urcap) was making a lot of requests, then linux os w…

[cap] I have been working on Polyscope 5.4.3 and my URCap has a python daemon file. Following error was occurred and I am not able to deduce a suitable reason for this error. Any help is strongly appreciated to solve this problem.

Hi, I am having the same problem too. I am working with a UR10 E-Series with V5.5.1.82186. A have a Python-Daemon communicating with the URSCRIPTand within the daemon is also a RTDE communication running. The error is difficult to reproduce. But all my test bring the same error after a couple of h…

We found that in case of “bad programming” on the UR side the UR program throw one of the following exceptions: XMLRPC: Failed with exception: Unable to transport XML to server and get XML response back. libcurl failed to execute the HTTP POST transaction, explaining: Recv failure: Connection re…

What is the xmlrpc server that you use? “Connection reset by peer” sounds like the problem on the server side.

Our daemon is written in python 2.7, we import xmlrpclib and from SimpleXMLPRCServer we import SimpleXMLPRCServer. We register some functions with the “register_function” method and then we call the “serve_forever” method

Thanks, I’ll try to reproduce this issue.

Hello guys! We’re currently developing a URCap and we’re facing this problem, too. After a couple of hours we’re getting a “XMLRPC: Failed with exception: Unable to transport XML to server and get XML response back. libcurl failed to execute the HTTP POST transaction, explaining: Recv failure: Con…

Any news about your tests? Did you reproduce the issue?

Yes, I was able to reproduce the issue, and it’s queued to be fixed. It is however difficult to reproduce the issue consistently. I’ll keep you posted if any workaround is possible.

I am very happy to see, UR is going to solve this issue. Many thanks to all of this community for supporting this thread. Here is some useful information coming from our tests. Issue description: Calling the XMLRPC function from URScript client randomly invokes an error. Robot program is stopped …

"No Controller" error on real robot

Technical Questions

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Program stops when trying to communicate with Daemon Technical Questions	15	1850	July 6, 2021
Controller shuts down while urcap development URCap Development no-controller	4	687	March 3, 2020
Reoccurring “No controller” errors Report a Bug	7	2174	June 19, 2024
Error: no controller ur5 Technical Questions	8	1283	July 3, 2024
Attempting to use RTDE interface via XML-RPC communication, Polyscope GUI stops responding! Robot Communication	3	1595	August 21, 2020

"No Controller" error on real robot

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