SSL issues proxying to Nexus 1 instance

We’ve got a Nexus 3 OSS and a Nexus 1 instance. We recently disabled TLS < 1.2 on Nexus 1. Since then, we see the following error on Nexus 3 when configuring a new proxy repo: “Server chose TLSv1, but that protocol version is not enabled or not supported by the client.”
I’d seen this guide which refers to Nexus 2 How to Configure HTTPS Protocols Used By Nexus – Sonatype Support however I can’t find the wrapper.conf file so not sure if the setup is the same on Nexus 3. Does anyone have any thoughts on how to fix?

Full error:
2019-11-04 08:50:28,791+0000 INFO [qtp1620791341-1708] USER com.sonatype.nexus.ssl.plugin.internal.CertificateRetriever - Retrieving certificate from https://:443
2019-11-04 08:50:29,043+0000 ERROR [qtp1620791341-1708] USER org.sonatype.nexus.extdirect.internal.ExtDirectExceptionHandler - Failed to invoke action method: ssl_Certificate.retrieveFromHost, java-method: com.sonatype.nexus.ssl.plugin.internal.ui.CertificateComponent.retrieveFromHost
java.io.IOException: Server chose TLSv1, but that protocol version is not enabled or not supported by the client.
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 org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:83)
at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:59)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:238)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:250)
at com.sonatype.nexus.ssl.plugin.internal.ui.CertificateComponent.retrieveFromHost(CertificateComponent.groovy:85)
at com.palominolabs.metrics.guice.ExceptionMeteredInterceptor.invoke(ExceptionMeteredInterceptor.java:23)
at com.palominolabs.metrics.guice.TimedInterceptor.invoke(TimedInterceptor.java:26)
at org.sonatype.nexus.validation.internal.ValidationInterceptor.invoke(ValidationInterceptor.java:53)
at org.apache.shiro.guice.aop.AopAllianceMethodInvocationAdapter.proceed(AopAllianceMethodInvocationAdapter.java:49)
at org.apache.shiro.authz.aop.AuthorizingAnnotationMethodInterceptor.invoke(AuthorizingAnnotationMethodInterceptor.java:68)
at org.apache.shiro.guice.aop.AopAllianceMethodInterceptorAdapter.invoke(AopAllianceMethodInterceptorAdapter.java:36)
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.softwarementors.extjs.djn.router.dispatcher.DispatcherBase.invokeJavaMethod(DispatcherBase.java:142)
at com.softwarementors.extjs.djn.router.dispatcher.DispatcherBase.invokeMethod(DispatcherBase.java:133)
at org.sonatype.nexus.extdirect.internal.ExtDirectDispatcher.invokeMethod(ExtDirectDispatcher.java:82)
at com.softwarementors.extjs.djn.router.dispatcher.DispatcherBase.dispatch(DispatcherBase.java:63)
at com.softwarementors.extjs.djn.router.processor.standard.StandardRequestProcessorBase.dispatchStandardMethod(StandardRequestProcessorBase.java:73)
at com.softwarementors.extjs.djn.router.processor.standard.json.JsonRequestProcessor.processIndividualRequest(JsonRequestProcessor.java:502)
at com.softwarementors.extjs.djn.router.processor.standard.json.JsonRequestProcessor.processIndividualRequestsInThisThread(JsonRequestProcessor.java:150)
at com.softwarementors.extjs.djn.router.processor.standard.json.JsonRequestProcessor.process(JsonRequestProcessor.java:133)
at com.softwarementors.extjs.djn.router.RequestRouter.processJsonRequest(RequestRouter.java:83)
at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.processRequest(DirectJNgineServlet.java:632)
at com.softwarementors.extjs.djn.servlet.DirectJNgineServlet.doPost(DirectJNgineServlet.java:595)
at org.sonatype.nexus.extdirect.internal.ExtDirectServlet.doPost(ExtDirectServlet.java:135)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286)
at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276)
at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181)
at com.google.inject.servlet.DynamicServletPipeline.service(DynamicServletPipeline.java:71)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:112)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at org.sonatype.nexus.security.SecurityFilter.executeChain(SecurityFilter.java:85)
at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at org.sonatype.nexus.security.SecurityFilter.doFilterInternal(SecurityFilter.java:101)
at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.sonatype.nexus.licensing.internal.LicensingRedirectFilter.doFilter(LicensingRedirectFilter.java:114)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.codahale.metrics.servlet.AbstractInstrumentedFilter.doFilter(AbstractInstrumentedFilter.java:112)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at org.sonatype.nexus.internal.web.ErrorPageFilter.doFilter(ErrorPageFilter.java:79)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at org.sonatype.nexus.internal.web.EnvironmentFilter.doFilter(EnvironmentFilter.java:101)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at org.sonatype.nexus.internal.web.HeaderPatternFilter.doFilter(HeaderPatternFilter.java:98)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
at com.google.inject.servlet.DynamicFilterPipeline.dispatch(DynamicFilterPipeline.java:104)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135)
at org.sonatype.nexus.bootstrap.osgi.DelegatingFilter.doFilter(DelegatingFilter.java:73)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1700)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1667)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at com.codahale.metrics.jetty9.InstrumentedHandler.handle(InstrumentedHandler.java:239)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:152)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:505)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:698)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:804)

In Nexus Repo 3 you can add JVM options by editing the $installdir/bin/nexus.vmoptions file.