Error "Gradle sync failed: Connection refused: connect"

Question

So I just installed Android Studio again after a long time and it asked me to configure the proxy, so I did. I tested the connection and it worked.

Then it asked me to configure the proxy settings for Gradle and I used the same configurations.

Now, when loading the latest Vuforia Sample project, I get an error:

Gradle sync failed: Connection refused: connect

I've looked everywhere on the web, but I can't find a solution. It can't be the proxy settings; I've configured Gradle just like the IDE.

If you are having this error without using a Proxy, try `File -> Invalidate Caches / Restart`. It did the trick. (I also cleaned the project but I don't think it helped.) — Albert Vila Calvo, Jan 16 '18 at 11:23

score 41 · Answer 1 · edited Apr 23 '22 at 20:09

41

I was caught with the same issue and was trying bypass proxies on Mac.

I removed the proxy from the system level (.bashrc) and Android Studio (gradle.properties). I had no luck!

I found Android Studio unable to bypass the proxy and finally found the proxy was cached in Gradle in the below file.

~/.gradle/gradle.properties

Essentially, to make sure proxy references were muted in all gradle.prorties, including the Gradle cache.

Gradle cache could be find as below (in Android view)

edited Apr 23 '22 at 20:09

Peter Mortensen

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answered Mar 10 '18 at 12:22

Faisal

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Seems like when you set a proxy and then unset it, this file still holds the proxy values. Removed the proxy values and boom, it works like a charm after rebuilding my project! – Hossein J Aug 03 '18 at 23:25
Awesome answer! Thanks a lot! – Sepehr Nov 26 '19 at 09:54
This file is hidden like a needle in haystack. Your answer is gold, thanks ! – Jack' Mar 12 '20 at 13:14

score 38 · Accepted Answer · edited Apr 23 '22 at 19:49

38

You should configure Proxy settings in Android Studio’s menu (File → Settings). Another strategy is to configure the file gradle.properties.

So, add these lines at the end of gradle.properties, located on the app folder base.

systemProp.http.proxyPassword=[PASSWORD]
systemProp.http.proxyHost=[IP ADDRESS]
systemProp.https.proxyPort=[PORT, TYPICALLY 3128]
systemProp.https.proxyUser=[USERNAME]
systemProp.https.proxyHost=[IP ADDRESS]
systemProp.https.proxyPassword=[PASSWORD]
systemProp.http.proxyPort=[PORT, TYPICALLY 3128]
systemProp.http.proxyUser=[USERNAME]

Pay attention. The passwords and other values that have special characters must have slash character such as (\#) and so on.

edited Apr 23 '22 at 19:49

Peter Mortensen

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answered Mar 31 '16 at 10:49

e2a

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I allready did that, however it did not resolve my problem! :( – 000000000000000000000 Mar 31 '16 at 11:01
Do you restart AS ? Do you check if Cache and Invalidate were performed ? – e2a Mar 31 '16 at 11:50
Yes! Twice at least. How do I check that? – 000000000000000000000 Mar 31 '16 at 11:51
Go to File | Cache and Invalidate (select restart option). Can you put his `gradle.properties` and `build.gradle` here (i.e., in his question) ? – e2a Mar 31 '16 at 12:01
This worked for me. Updated the gradle.properties file but was still facing the issue. Reason behind was presence of special characters in password. – udai Aug 16 '16 at 13:33
Thanks a lot. For me `grade.properties` had a proxy because of which the sync was failing. – Lokesh Dec 11 '17 at 12:31

score 16 · Answer 3 · edited Apr 23 '22 at 20:14

16

I have the same problem:

can't connect to socks proxy connection refused

Try

Turn off VPN
Menu File → Invalidate Caches / Restart

This operation can fix this problem.

edited Apr 23 '22 at 20:14

Peter Mortensen

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answered May 10 '18 at 03:18

Cavalier123

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In my case, even Split Tunneling other apps was affecting Android Studio. I had to turn off VPN altogether. – Sai Feb 26 '21 at 08:32

score 15 · Answer 4 · edited Apr 23 '22 at 19:54

15

This happened to me when I updated Android Studio to the latest version.

The fix was to go to menu File → Settings → Build Execution Deployment → Gradle and check Use local Gradle distribution.

After that, in Gradle Home put the location to the Gradle directory - in my case it was C:\Program Files\Android\Android Studio\gradle\gradle-3.2.

edited Apr 23 '22 at 19:54

Peter Mortensen

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answered Mar 12 '17 at 19:08

Davor Zlotrg

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Sayed Abolfazl Fatemi · Answer 5 · 2019-10-30T18:22:45.163

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Use gradle.properties file in this path and check proxy info within:

C:\Users\[Windows-User]\.gradle\gradle.properties

I solve the problem by comment proxy definitions in this file.

Commented lines:

#systemProp.http.proxyHost=127.0.0.1
#systemProp.https.proxyPort=9050
#systemProp.https.proxyHost=127.0.0.1
#systemProp.http.proxyPort=9050

# used for comment in gradle files

edited Oct 30 '19 at 18:22

answered Jul 21 '19 at 15:14

Sayed Abolfazl Fatemi

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score 9 · Answer 6 · edited Mar 28 '22 at 18:19

I had the same problem recently. I had my proxy setup OK, but Gradle could not update. After a few attempts, I noticed that the Use HTTPS proxy check button was not selected.

I noticed that on the HTTPS proxy dialog which pops up while Android Studio starts.

Keep in mind that you might not be able to see the HTTPS setup from File → Settings → HTTP Proxy, so it is important to do it using the pop-up proxy dialog on Android Studio start.

You also may have the HTTPS form filled up, but you need to select that checkbox as well (at least that worked for me).

So here are the steps I follow:

Invalidate caches and restart
Close any project opens by default on Android Studio startup
Select "Use https proxy on proxy dialog

score 9 · Answer 7 · edited Apr 23 '22 at 19:56

9

This should work:

Go to 'Gradle Scripts'
Then go to 'gradle.properties'.
There you will see proxy settings something like:

systemProp.http.proxyHost=[YOUR PROXY]

systemProp.http.proxyPort=[PORT]

As you may see, this is for 'http' only.
Just add the same for 'https':

systemProp.https.proxyHost=[YOUR PROXY]

systemProp.https.proxyPort=[PORT]

It worked for me.

edited Apr 23 '22 at 19:56

Peter Mortensen

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answered Jun 23 '17 at 09:03

Shubham Chandak

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yoAlex5 · Answer 8 · 2023-01-12T11:47:30.207

Gradle sync failed: Connection refused: connect

When I got this error I used the Charles Proxy app (even though Charles Proxy was completely closed). To solve it, I just disabled SSL Proxying inside Charles Proxy.

After that I got

Cause: unable to find valid certification path to requested target

and

Connection refused

To solve it, just close Charles Proxy (with disabled (stopped) SSL Proxying) and restart Android Studio or analyse traffic and exclude unnecessary hosts (Proxy* -> *SSL Proxy Settings... -> Exclude block). In my case it was

<some_digits>.cloudfront.net

score 3 · Answer 9 · edited Apr 23 '22 at 20:20

3

This worked for me

commented these lines in Gradle properties

systemProp.https.proxyPort=41258 systemProp.http.proxyHost=109.199.77.83 systemProp.https.proxyHost=109.199.77.83 systemProp.http.proxyPort=41258
Use VPN
Rebuild the project

edited Apr 23 '22 at 20:20

Peter Mortensen

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answered Oct 02 '18 at 02:56

BatyrCan

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Proxy settings were on C:/users/[user]/.gradle/gradle.properties for me, and not on Android Studio – yossharel Nov 29 '18 at 05:53

score 3 · Answer 10 · edited Apr 23 '22 at 20:38

3

What works for me:

Go to file
Invalidate cache / Restart
Select Invalidate & Restart

It should work now.

edited Apr 23 '22 at 20:38

Peter Mortensen

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answered Jul 17 '20 at 13:27

Bhoopi

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What do you mean by *"Go to file"*? A menu by the name "File"? Opening a particular file in a text editor? Something else? Please respond by [editing (changing) your answer](https://stackoverflow.com/posts/62954992/edit), not here in comments (***without*** "Edit:", "Update:", or similar - the answer should appear as if it was written today). – Peter Mortensen Apr 23 '22 at 20:39

score 2 · Answer 11 · edited Apr 23 '22 at 20:00

2

My case might be unique as in I got Android project code and was facing this error when trying to build it. I just removed the proxy properties in gradle.propertiesand it worked fine.

edited Apr 23 '22 at 20:00

Peter Mortensen

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answered Jan 08 '18 at 17:10

Wahib Ul Haq

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score 1 · Answer 12 · edited Apr 23 '22 at 19:52

1

Try the latest version of the Gradle build tools in build.gradle(Module:app)

Here is a screenshot:

Screenshot

edited Apr 23 '22 at 19:52

Peter Mortensen

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answered Dec 16 '16 at 10:28

Arash

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score 1 · Answer 13 · edited Apr 23 '22 at 19:57

1

I solved my problem by putting the proxy options with http and https. Before it was just http and was giving an error. After I added https, it worked.

edited Apr 23 '22 at 19:57

Peter Mortensen

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answered Aug 28 '17 at 11:26

Pipiluço Capetei

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What do you mean by *"putting the proxy options with http and https"*? What is the end result? Please respond by [editing (changing) your answer](https://stackoverflow.com/posts/45917882/edit), not here in comments (***without*** "Edit:", "Update:", or similar - the answer should appear as if it was written today). – Peter Mortensen Apr 23 '22 at 19:58

score 1 · Answer 14 · edited Apr 23 '22 at 20:16

1

In my case, I verified that in File → Settings → HTTP proxy, I had checked the "no proxy" option.

Then I created an exception in my antivirus software for Android Studio, and deleted the lines of proxy configuration of my gradle.properties file. Finally, I clicked on Sync Project with Gradle files and it worked.

edited Apr 23 '22 at 20:16

Peter Mortensen

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answered Jun 05 '18 at 19:42

Guillermo Perez

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score 1 · Answer 15 · edited Apr 23 '22 at 20:42

1

Check and review all of these files for having proxy settings:

YOUR_PROJECT_ROOT/App/gradle.properties
~/.gradle/gradle.properties
~/.AndroidStudioX.Y/config/options/proxy.settings.xml

Note: replace X.Y with your current Android Studio version.

edited Apr 23 '22 at 20:42

Peter Mortensen

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answered Sep 15 '20 at 00:32

Omid Raha

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score 1 · Answer 16 · edited Apr 23 '22 at 20:44

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I did the following and my problem was easily solved:

Go to menu File → Settings → Appearance & Behavior → System Settings → HTTP Proxy
On this page, select option No Proxy.
Download a VPN client.
Connect to one of the servers and sync the Gradle.

I hope your problem is solved!

edited Apr 23 '22 at 20:44

Peter Mortensen

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answered Jan 31 '21 at 05:43

Reza

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score 1 · Answer 17 · answered Feb 16 '22 at 12:10

1

Invalidate caches and restart worked for me.

answered Feb 16 '22 at 12:10

Sameer Shelar

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What caches? Where? How? – Peter Mortensen Apr 23 '22 at 20:46
Goto File > Invalidate Caches > (A dialog will appear) > Click on Invalidate Caches and Restart button. – Sameer Shelar May 05 '22 at 12:17

score 0 · Answer 18 · edited Apr 23 '22 at 19:59

0

I got the issue when I downloaded the Glide project and solved the issue by installing JDK 1.8.0_151 and reset the JAVA_HOME. My old JDK was 1.8.0_131, and I removed the old version.

edited Apr 23 '22 at 19:59

Peter Mortensen

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answered Oct 23 '17 at 10:32

JohnRambo

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What is "the Glide project"? What does it refer to? Can you elaborate? – Peter Mortensen Apr 23 '22 at 20:01
OK, the OP seems to have left the building (*"Last seen more than 1 year ago"*). Can somebody else chime in? – Peter Mortensen Apr 23 '22 at 20:02

score 0 · Answer 19 · answered Mar 10 '18 at 13:04

0

If there is VPN running on your computer you might have to turn it off.

answered Mar 10 '18 at 13:04

Ege Kuzubasioglu

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Hi there Ege, I'm having the same issue and I think it's because maybe my ISP in Russia where I'm currently visiting is blocking the connection. I've tried a VPN but no luck. Is there some way to use a VPN rather than turn it off as you say? – seenickcode May 09 '18 at 20:04
1

you can try to remove proxy properties in your `gradle.properties`, then `Invalidate Caches ` finally you can re-open your VPN and start Android Studio. Perhaps you can call your ISP and ask why the hell they are blocking your connection for this though – Ege Kuzubasioglu May 12 '18 at 08:19

score 0 · Answer 20 · edited Apr 23 '22 at 20:13

On a Mac, open a terminal window and hit the below command:

echo $proxy

It should return your IP address and port number.

Now check your gradle.properties of your project and set the below properties as per your login details:

 systemProp.http.proxyPort=80
 systemProp.http.proxyUser=<userName>
 org.gradle.parallel=true
 systemProp.http.proxyPassword=<PassWord>
 org.gradle.jvmargs=-Xmx1536m
 systemProp.https.proxyHost=<IP Address>
 systemProp.http.proxyHost=<Proxy Host URL>
 systemProp.https.proxyPort=<Port number form above>

score 0 · Answer 21 · edited Apr 23 '22 at 20:20

0

Go to Preferences → Appearance & Behavior → System Settings → HTTP Proxy.

If your network needs a proxy, setup Manual proxy configuration.

Else, select Auto-detect proxy settings.

edited Apr 23 '22 at 20:20

Peter Mortensen

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answered Dec 07 '18 at 09:51

Subhrajyoti Sen

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score 0 · Answer 22 · edited Apr 23 '22 at 20:22

0

I find when I change the option of Preferences → Appearance & Behavior → System Settings → HTTP Proxy to Manual proxy configuration, the Gradle properties of the project won't change, so I add:

systemProp.http.proxyHost= myProxyHost
systemProp.http.proxyPort= myProxyPort

Then it runs well.

edited Apr 23 '22 at 20:22

Peter Mortensen

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answered Mar 22 '19 at 07:25

fengcheng zhao

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score 0 · Answer 23 · edited Apr 23 '22 at 20:24

In your gradle.properties file inside your app project, add the following properties (both HTTP and HTTPS):

systemProp.http.proxyHost=<proxyHost>
systemProp.http.proxyPort=<proxyPort>
systemProp.https.proxyHost=<proxyHost>
systemProp.https.proxyPort=<proxyPort>

If your network has a proxy (not defined in your system configuration), go to:

Menu File → Settings → Appearance & Behavior → System Settings → HTTP Proxy.

And set up Manual proxy configuration. Otherwise, check Auto-detect proxy settings.

score 0 · Answer 24 · edited Apr 23 '22 at 20:25

0

A lot of people suggested changing proxy settings, but that was not my problem.

At the time of writing, com.android.tools.build:gradle:3.3.2 was recently released and I was not able to update to that from my network.

However, com.android.tools.build:gradle:3.3.1 was available and it no longer threw that error.

edited Apr 23 '22 at 20:25

Peter Mortensen

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answered Apr 09 '19 at 14:49

d4c0d312

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Rahul Sharma · Answer 25 · 2022-05-25T09:43:38.093

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I am writing on this old post as I have also faced the same problem after updating the Android Studio to 3.5. I was not using any proxy setting in my current project, still, it was showing me connection refused error. To resolve this problem I deleted the .android and .gradle file from User folder and restarted the android studio. It helped me to rebuild the project successfully.

Hope it will help you out.

edited May 25 '22 at 09:43

answered Sep 29 '19 at 08:53

Rahul Sharma

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score 0 · Answer 26 · edited Apr 23 '22 at 20:28

0

I finally found the solution is to disable Avast Antivirus in my case, so if you too have an antivirus, try it or make an exception for Android Studio.

edited Apr 23 '22 at 20:28

Peter Mortensen

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answered Oct 30 '19 at 00:26

abdelali boulhilate

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score 0 · Answer 27 · edited Apr 23 '22 at 20:31

If you ever used Shadowsocks X-NG on Mac, (mine is version 1.7.1 (1)) and once use the Global Mode, it will automatically add the following command:

~/.gradle/gradle.propertries:

#Mon Nov 18 03:59:09 CST 2019
systemProp.http.proxyHost=127.0.0.1
systemProp.https.proxyPort=1086
systemProp.https.proxyHost=127.0.0.1
systemProp.http.proxyPort=1086

When you close Shadowsocks X-NG, Android studio still use the proxy, and that is why it shows

Gradle sync failed: Connection refused

Please comment those lines out, and rebuild the project again.

## For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
#
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
# Default value: -Xmx1024m -XX:MaxPermSize=256m
# org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
#
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true
#Mon Nov 18 03:59:09 CST 2019
#systemProp.http.proxyHost=127.0.0.1
#systemProp.https.proxyPort=1086
#systemProp.https.proxyHost=127.0.0.1
#systemProp.http.proxyPort=1086

score 0 · Answer 28 · edited Apr 23 '22 at 20:32

0

Amending the gradle.properties file did not work for me. What worked was manually setting the proxy in settings. Additionally, I also had to enter my user name and password for the network.

edited Apr 23 '22 at 20:32

Peter Mortensen

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answered Dec 06 '19 at 21:55

kyzen

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score 0 · Answer 29 · edited Apr 23 '22 at 20:34

In Android Studio 3.6.1 you can set the Proxy and after that, you can change that to no proxy. If still having the same issue then follow these steps:

Check the Gradle location from in Settings → Build, Execution → Deployment* → Gradle. Find the location of Gradle in your PC.
Now go to that location and open the Gradle.properties file. In this file, you have to remove the proxy settings lines.
That's it. Now your project is working.

score 0 · Answer 30 · edited Apr 23 '22 at 20:40

0

For me it worked like this:

turned off firewall and antivirus software
deleted the .gradle file. Location: C:\Users\user\.gradle
restarted Android Studio
checked the Internet connection

P.S. There is no proxy in my system (windows 8.1)

And it worked!

edited Apr 23 '22 at 20:40

Peter Mortensen

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answered Sep 12 '20 at 12:21

Div

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score -1 · Answer 31 · edited Apr 23 '22 at 20:18

-1

Menu File → Settings... → Build, Execution, Deployment → Gradle → Android Studio.

Check "Enable embedded Maven repository".

edited Apr 23 '22 at 20:18

Peter Mortensen

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answered Sep 29 '18 at 17:40

Eduardo Fraile Ferreira

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Is downloading Maven dependencies the only thing Gradle would go through your proxy for? If so, this is a good answer, but you should remove the parts that are not in English. – Noumenon Sep 29 '18 at 18:08

score -1 · Answer 32 · edited Apr 23 '22 at 20:45

-1

In my case, it was because I turned on the Wi-Fi settings, but actually my laptop Internet access using a LAN cable.

edited Apr 23 '22 at 20:45

Peter Mortensen

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answered Nov 30 '21 at 04:24

Exel Staderlin

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Error "Gradle sync failed: Connection refused: connect"

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