ERROR: Error fetching remote repo 'origin'

i have tried so many times but getting the same issue..
it seems like firewall rules issue but also open port 443 , unable to solve please help me out on this.

> /usr/bin/git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
> /usr/bin/git config remote.origin.url https://github.com/Mukhtarali212/simple-java-maven-app.git # timeout=10
Fetching upstream changes from https://github.com/Mukhtarali212/simple-java-maven-app.git
> /usr/bin/git --version # timeout=10
using GIT_SSH to set credentials
> /usr/bin/git fetch --tags --progress https://github.com/Mukhtarali212/simple-java-maven-app.git +refs/heads/*:refs/remotes/origin/* # timeout=10
ERROR: Error fetching remote repo 'origin'
hudson.plugins.git.GitException: Failed to fetch from https://github.com/Mukhtarali212/simple-java-maven-app.git
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:909)
at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1131)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1167)
at hudson.scm.SCM.checkout(SCM.java:505)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1206)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:574)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
at hudson.model.Run.execute(Run.java:1856)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
Caused by: hudson.plugins.git.GitException: Command "/usr/bin/git fetch --tags --progress https://github.com/Mukhtarali212/simple-java-maven-app.git +refs/heads/*:refs/remotes/origin/*" returned status code 128:
stdout:
stderr: fatal: unable to access 'https://github.com/Mukhtarali212/simple-java-maven-app.git/': Failed to connect to github.com port 443: Connection timed out

at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2430)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandWithCredentials(CliGitAPIImpl.java:2044)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$500(CliGitAPIImpl.java:81)
at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$1.execute(CliGitAPIImpl.java:569)
at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:161)
at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:154)
at hudson.remoting.UserRequest.perform(UserRequest.java:211)
at hudson.remoting.UserRequest.perform(UserRequest.java:54)
at hudson.remoting.Request$2.run(Request.java:369)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to ubuntu-1604-pcr7ye
at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1788)
at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:356)
at hudson.remoting.Channel.call(Channel.java:998)
at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
at com.sun.proxy.$Proxy87.execute(Unknown Source)
at hudson.plugins.git.GitSCM.fetchFrom(GitSCM.java:907)
at hudson.plugins.git.GitSCM.retrieveChanges(GitSCM.java:1131)
at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1167)
at hudson.scm.SCM.checkout(SCM.java:505)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1206)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:574)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
at hudson.model.Run.execute(Run.java:1856)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
ERROR: Error fetching remote repo 'origin'
[Google Cloud Storage Plugin] Uploading: build-log.txt
Finished: FAILURE

Start with the Jenkins build log and the GitSCM fetch command shown in the report, focusing on the timeout connecting to github.com on port 443. Reproduce the checkout failure in the stated Jenkins environment and document a verified cause and resolution; no source file or test is identified in the issue.

Written by the indexing model from the issue text.