withEnv(['AWS_ACCESS_KEY_ID=', 'AWS_SECRET_ACCESS_KEY=', 'HTTP_PROXY=http://example:3333', 'HTTPS_PROXY=http://example:3333', 'NO_PROXY=some,domain,names']) {
    sh 'aws sts assume-role --role-arn arn:aws:iam::...:role/RoleName --role-session-name "SessionName"'
}

withEnv(['AWS_ACCESS_KEY_ID=', 'AWS_SECRET_ACCESS_KEY=', 'HTTP_PROXY=http://example:3333', 'HTTPS_PROXY=http://example:3333', 'NO_PROXY=some,domain,names']) {
    withCredentials([[
        $class: 'AmazonWebServicesCredentialsBinding',
        credentialsId: 'SomeId',
        accessKeyVariable: 'AWS_ACCESS_KEY_ID',
        secretKeyVariable: 'AWS_SECRET_ACCESS_KEY'
    ]]) {
        echo "Test"
    }                    
}

hudson.remoting.ProxyException: java.net.SocketTimeoutException: connect timed out
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:339)
	at com.amazonaws.http.conn.ssl.SdkTLSSocketFactory.connectSocket(SdkTLSSocketFactory.java:142)
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
Caused: hudson.remoting.ProxyException: org.apache.http.conn.ConnectTimeoutException: Connect to sts.amazonaws.com:443 [sts.amazonaws.com/54.239.29.25] failed: connect timed out
	at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:151)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
	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 com.amazonaws.http.conn.ClientConnectionManagerFactory$Handler.invoke(ClientConnectionManagerFactory.java:76)
	at com.amazonaws.http.conn.$Proxy98.connect(Unknown Source)
	at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
	at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
	at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
	at com.amazonaws.http.apache.client.impl.SdkHttpClient.execute(SdkHttpClient.java:72)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeOneRequest(AmazonHttpClient.java:1285)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1101)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.doExecute(AmazonHttpClient.java:758)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeWithTimer(AmazonHttpClient.java:732)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.execute(AmazonHttpClient.java:714)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutor.access$500(AmazonHttpClient.java:674)
	at com.amazonaws.http.AmazonHttpClient$RequestExecutionBuilderImpl.execute(AmazonHttpClient.java:656)
	at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:520)
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.doInvoke(AWSSecurityTokenServiceClient.java:1368)
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.invoke(AWSSecurityTokenServiceClient.java:1335)
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.invoke(AWSSecurityTokenServiceClient.java:1324)
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.executeAssumeRole(AWSSecurityTokenServiceClient.java:491)
	at com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClient.assumeRole(AWSSecurityTokenServiceClient.java:464)
	at com.cloudbees.jenkins.plugins.awscredentials.AWSCredentialsImpl.getCredentials(AWSCredentialsImpl.java:129)
	at com.cloudbees.jenkins.plugins.awscredentials.AmazonWebServicesCredentialsBinding.bind(AmazonWebServicesCredentialsBinding.java:97)
	at org.jenkinsci.plugins.credentialsbinding.impl.BindingStep$Execution.start(BindingStep.java:114)
	at org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:268)
	at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:176)
	at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:122)
	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.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
	at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1213)
	at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022)
	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:42)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
	at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:157)
	at org.kohsuke.groovy.sandbox.GroovyInterceptor.onMethodCall(GroovyInterceptor.java:23)
	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:155)
	at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:155)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:159)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:129)
	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:129)
	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:17)