Hi Kamryn,
On your network are you using ZScaler or some other kind of proxy? I had this problem before with all Mendix projects that used Studio Pro 10.3+. At the end I found out it was because I needed to add the Root Certificate (of ZScaler in my case) into the installed JDK's keystore that Studio Pro uses.
You can find more information about it here on this other question I have answered where they have the same problem as you:
https://community.mendix.com/link/space/community/questions/134236
I hope that helps you solve your problem, best regards!
Zcaler was blocking this is what solved it for me:
go to ~/.gradle
or C:\Users\<USERNAME>\.gradle
Create or edit the file gradle.properties:
systemProp.http.proxyHost=localhost
systemProp.http.proxyPort=9000
systemProp.https.proxyHost=localhost
systemProp.https.proxyPort=9000
# If your proxy requires auth:# systemProp.http.proxyUser=YOURDOMAIN\\youruser
# systemProp.http.proxyPassword=yourpassword
# systemProp.https.proxyUser=YOURDOMAIN\\youruser
# systemProp.https.proxyPassword=yourpassword
systemProp.http.nonProxyHosts=localhost|127.0.0.1
systemProp.https.nonProxyHosts=localhost|127.0.0.1
The first 4 lines are i think the most important since 9000 is the Zcaler port. (but just copy all)
--> save file and close all running mendix processes and also all java.exe.
Restart Mendix -> Clean Deployment Directory -> Run