Cannot upload to Prusa Connect  

RE:

Have you previously connected successfully?

PrUSA tech support recently helped me get my PrUSA Slicer connected via PrUSA Link to my CoreONE printer. The secret issue turned out to be the built in Apple Security.  

I had to go to Settings/ Privacy & Security / Local Network and allow PrUSA Slicer to access the Network.  Also to allow VLC to access the Network for the Camera.

That was a real head slapper once the PrUSA tech guy reminded me about the Apple Network Security. The second problem was a typo in the connect password... 

Remember: PrUSA Connect is via the Cloud. That is not a Network connection.  PrUSA Link is the Network connection.

Posted by: @wilts01

I'm running Prusaslicer 2.94 on a Mac Studio running macOS 26.1.  When I try to upload a sliced model from Prusaslicer to Prusa Connect, I get the error message :

Error uploading to print host:

Failure when receiving data from the peer:

SSLRead() return error -9820

[Error 56]

I get a similar bug on my MacBook Pro.

The Prusa Connect tab works - I can control the printer etc.  It's just I can't upload the G code from the button on the front page.

Any suggestions on how to fix it?

Thanks Paul

RE: Cannot upload to Prusa Connect

Thanks for the reply.  I looked at the Local Network security settings and that was already set.  So it must be something else.

It used to work on my iMac but it doesn't look as it has ever worked on my new Mac Studio which is a copy of the iMac.  I'll put a request into tech support.

RE: Cannot upload to Prusa Connect

You are getting a different error than U was getting.

——

“The error "SSLRead() return error -9820" typically indicates a network-level issue during an SSL/TLS handshake, often related to a poor or unstable internet connection. This error commonly occurs when attempting to push large files to remote repositories via HTTPS, such as with GitHub or BitBucket, and is frequently associated with timeouts or interruptions in the data transfer process.”

”SSL (Secure Sockets Layer) is a security protocol designed to ensure privacy, authentication, and data integrity in internet communications. It encrypts data transmitted between a web browser and a server, preventing unauthorized access or tampering. SSL has been succeeded by TLS (Transport Layer Security), though the term "SSL" is still commonly used.”

RE:

Have you tried the PrUSA Link instead of the PrUSA Connect?

One way is to use the browser, go to the printer address. Log in.  Then upload the file.  

Also, does it work by the PrUSA phone app?

It used to work on my iMac but it doesn't look as it has ever worked on my new Mac Studio