Cannot open Eclipse Marketplace Cannot install remote marketplace locations: Cannot resolve host

Question

I am using eclipse Kepler version and trying to install Sonar plugin from Eclipse marketplace. But I am getting below error

Cannot open Eclipse Marketplace Cannot install remote marketplace locations: Cannot resolve host

This is most often caused by a problem with your internet connection. Please check your internet connection and retry. Unknown Host: http://marketplace.eclipse.org/catalogs/api/p marketplace.eclipse.org Cannot resolve host

This is most often caused by a problem with your internet connection. Please check your internet connection and retry. marketplace.eclipse.org

I tried below things as per solution suggested by some people.

Go to Window-> Preferences -> General -> Network Connection. And change below settings Active Provider-> Manual-> and check---> HTTP, HTTPS and SOCS. After restarting eclipse still the problem persisted.
I tried connecting to google.com from Eclipse Internet Explorer and able to see google homepage
Added line in eclipse.ini file -vmargs -Djava.net.preferIPv4Stack=true But still same issue

I am really frustated by this issue and couldn't find any help anywhere. If anyone has faced this issue and has an effective resolution, please assist.

Below is the snap of Proxy details

I am also struggling after trying all the provided solutions without success. — ulyssis2, Jun 08 '23 at 07:01

score 29 · Answer 1 · edited Feb 03 '18 at 04:32

29

The solution is:

Go to-Window->Preferences->General->Network Connections
Choose "Active Provider" To "Direct"
then click "apply" and then "ok".

It will Start Opening.

edited Feb 03 '18 at 04:32

Stephen Rauch

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answered Feb 03 '18 at 04:10

Harshit Saxena

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score 9 · Answer 2 · answered May 17 '18 at 11:41

9

I tried all the suggestions but no success for Eclipse Mars, Neo and Oxygen At last it worked for Eclipse Oxygen when I added following line to eclipse.ini file

-Djava.net.preferIPv4Stack=true

answered May 17 '18 at 11:41

Amol Dixit

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After trying all other options,this did the trick for me on Windows 10. – lionxlamb Jun 25 '20 at 05:58
FYI, it must be added next to `vmarg` in eclipse.ini file. – Ram Aug 02 '21 at 12:08

score 8 · Answer 3 · answered Jun 08 '18 at 03:59

Go to: Window->Preferences->General->Network Connections
Choose "Active Provider" To "Native"
Click 'apply' and then 'Ok'

NOTE: I gone through all possibilities - marketplace.eclipse.org/catalogs/api* (Not Working) - change 'Active Provider' to 'Manual'/'Direct'(Not Working) - Disable Proxies entries/Bypass(Not Working)

score 5 · Answer 4 · edited Jul 08 '17 at 00:15

5

Try to add the host like this: marketplace.eclipse.org/catalogs/api* in Proxy bypass.

edited Jul 08 '17 at 00:15

Alex M

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answered Jul 07 '17 at 14:45

EderX

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1

these should be checked, right? and for me its not working in any case. on CentOS 7 – Sarz Oct 20 '17 at 05:55

score 5 · Answer 5 · answered Jan 14 '18 at 05:11

Open command prompt (windows start button, type cmd in search)
Click top left of command prompt, click properties, enable quick edit mode
Copy: setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
Right click on command prompt, should paste
Hit enter. That easy!

score 4 · Answer 6 · answered Dec 14 '17 at 05:37

4

Eclipse Oxygen version: Window->Preferences->network connections->default apply will reset the settings. restart eclipse and it should work

answered Dec 14 '17 at 05:37

clipper

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score 3 · Answer 7 · answered Jul 11 '18 at 13:42

3

I tried all the suggestions but no success for Eclipse Neon and Oxygen. At last it worked for Eclipse Neon when I added below line in Configuration Settings in eclipse folder.

-Djava.net.preferIPv4Stack=true

Edit Configuration Settings in eclipse folder and add the below line and save it. It will work.

answered Jul 11 '18 at 13:42

Destro

31
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Adding this entry in eclipse.ini file worked for me. Thanks. – Rajesh Kolhapure Aug 30 '20 at 09:03

score 2 · Answer 8 · answered Sep 27 '18 at 09:14

For me I solved the problem by those steps:

Use the CNTLM proxy, which can be installed and run by following this GitHub readme file.
Go to-Window->Preferences->General->Network Connections
Click on an empty line and add a host and the same port that youn configured in CNTLM

score 1 · Answer 9 · answered Jan 11 '22 at 15:05

I got a similar issue and here is how I solved it.

I didn't find any other similar answers that work for me, so here it is:

Go to : Window > Preferences > General > Network Connections

Put the Active Provider to Manual.
Add the correct Host and Port for all Proxy entries.
Click on the line with SOCKS and click on Clear on the right.
Delete all lines in Proxy bypass and add a line with localhost.

score 0 · Answer 10 · edited May 23 '17 at 12:24

0

Are you running behind a NTLM proxy? If so you might find help at this Thread

A bit hacky workaround would be to download the plugins manually and than add it via 'Add local update site'.

edited May 23 '17 at 12:24

Community

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answered Jan 19 '17 at 09:26

score 0 · Answer 11 · answered Nov 02 '17 at 08:09

0

I had same issue. I solved it with following steps:

Window -> Preferences -> Secure Storage
Tab - Contents
Delete [Default Secure Storage]
Restart Eclipse

Don't worry - Storage will be re-created automatically.

answered Nov 02 '17 at 08:09

vagovszkym

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Didnt understand why, but This worked for me! Thank you – Jarvis Nov 09 '17 at 06:28
it didn't worked for me either. I tried Eclipse Mars / Oxygen / Neo – Amol Dixit May 17 '18 at 10:48

score 0 · Answer 12 · answered May 30 '18 at 10:58

I have tried all the possible suggestions given above but finally got answer for this : This may not be the right way to install the plugin but it worked for me and it served my purpose

Open the below URL : http://marketplace.eclipse.org/marketplace-client-intro?mpc_install=252148

Open eclipse and drag the plugin from the above url drop on eclipse [on top near header]

It will start downloading and eclipse will restart after successful installation.

score 0 · Answer 13 · answered Aug 07 '18 at 09:30

0

I tried all the suggestion above with Eclipse Photon. None worked. Finally got the marketplace to open by installing Eclipse to a path with no white spaces.

answered Aug 07 '18 at 09:30

JKo

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score 0 · Answer 14 · answered Dec 17 '19 at 13:02

0

when launching, java application defaults to listening to ipv6 exclusively. Modify .ini configuration settings file present in the folder by adding -Djava.net.preferIPv4Stack=true below the -vmargs. This sets the java to prefer IPV4 stack.

answered Dec 17 '19 at 13:02

Vineeth Varada

36
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score 0 · Answer 15 · answered May 07 '20 at 07:36

This usually happens when you have any proxy connection set in your network settings. You can check that in your Proxy Settings in Windows.

Just copy the proxy host from there and add it in Proxy Bypass Host list inside

Window->Preferences->General->Network Connections
Then click on Apply & CLose.

It should work perfectly.

score 0 · Answer 16 · answered Jul 18 '20 at 06:12

I encountered the same today morning on Ubuntu 20.04LTS with Eclipse Version: 2020-03 (4.15.0). This is what worked for me.

sudo vim /etc/resolve.conf

And add these 2 lines.

nameserver 8.8.8.8
nameserver 8.8.4.4

Save the file and restart the network. It worked like a charm.

Cannot open Eclipse Marketplace Cannot install remote marketplace locations: Cannot resolve host

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