Unable to Install any plugins - java.net.SocketTimeoutException: Read timed out

Unable to install any plugins on the jenkins ubuntu instance. 
Jenkins is trying to download the plugins from the below link, but fails to with read timeout exception

https://updates.jenkins.io/download/plugins/cloudbees-folder/6.15/cloudbees-folder.hpi

When I hit the above link in browser, I either get 504 Gateway timout error ot 404 Not-Fount Exception.

Exception stack trace:

2020-11-13 00:55:34.977+0000 [id=68] INFO h.model.UpdateCenter$DownloadJob#run: Starting the installation of workflow-api on behalf of admin2020-11-13 00:55:34.977+0000 [id=68] INFO h.model.UpdateCenter$DownloadJob#run: Starting the installation of workflow-api on behalf of admin2020-11-13 00:56:35.035+0000 [id=68] INFO h.m.UpdateCenter$UpdateCenterConfiguration#download: Downloading workflow-api2020-11-13 00:56:35.036+0000 [id=68] SEVERE h.model.UpdateCenter$DownloadJob#run: Failed to install workflow-apijava.net.SocketTimeoutException: Read timed out at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) at java.net.SocketInputStream.read(SocketInputStream.java:171) at java.net.SocketInputStream.read(SocketInputStream.java:141) at sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:457) at sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(SSLSocketInputRecord.java:68) at sun.security.ssl.SSLSocketImpl.readApplicationRecord(SSLSocketImpl.java:1095) at sun.security.ssl.SSLSocketImpl.access$200(SSLSocketImpl.java:72) at sun.security.ssl.SSLSocketImpl$AppInputStream.read(SSLSocketImpl.java:815) at java.io.BufferedInputStream.fill(BufferedInputStream.java:246) at java.io.BufferedInputStream.read1(BufferedInputStream.java:286) at java.io.BufferedInputStream.read(BufferedInputStream.java:345) at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:735) at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:678) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1593) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498) at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:3061) at java.net.URLConnection.getHeaderFieldLong(URLConnection.java:629) at java.net.URLConnection.getContentLengthLong(URLConnection.java:501) at java.net.URLConnection.getContentLength(URLConnection.java:485) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(HttpsURLConnectionImpl.java:412) at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1264)Caused: java.net.SocketTimeoutException: Read timed out at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1950) at sun.net.www.protocol.http.HttpURLConnection$10.run(HttpURLConnection.java:1945) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1944) at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1514) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268) at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1280)Caused: java.io.IOException: Failed to load https://updates.jenkins.io/download/plugins/workflow-api/2.40/workflow-api.hpi to /var/lib/jenkins/plugins/workflow-api.jpi.tmp at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1287)Caused: java.io.IOException: Failed to download from https://updates.jenkins.io/download/plugins/workflow-api/2.40/workflow-api.hpi (redirected to: https://get.jenkins.io/plugins/workflow-api/2.40/workflow-api.hpi) at hudson.model.UpdateCenter$UpdateCenterConfiguration.download(UpdateCenter.java:1321) at hudson.model.UpdateCenter$DownloadJob._run(UpdateCenter.java:1869) at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:2147) at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:1843) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at hudson.remoting.AtmostOneThreadExecutor$Worker.run(AtmostOneThreadExecutor.java:118) at java.lang.Thread.run(Thread.java:748)