{"id":1115,"date":"2015-11-04T19:15:05","date_gmt":"2015-11-05T00:15:05","guid":{"rendered":"http:\/\/www.bhargavs.com\/?p=1115"},"modified":"2015-11-04T19:15:05","modified_gmt":"2015-11-05T00:15:05","slug":"mac-mail-not-connecting-to-exchange-server-part-1","status":"publish","type":"post","link":"https:\/\/bhargavs.com\/index.php\/2015\/11\/04\/mac-mail-not-connecting-to-exchange-server-part-1\/","title":{"rendered":"Mac Mail not connecting to Exchange Server &#8211; Part 1"},"content":{"rendered":"<p>My good friend and renowned Exchange MVP Jeff Guillet (expta.com fame) brought an interesting issue to my attention. On his Mac, built-in Mail client would not connect to Exchange through KEMP LoadMaster. The load balancer was configured to user Layer 7 load balancing. The Exchange environment was mixed Exchange 2013 and Exchange 2016 but load balancer was configured to use only Exchange 2016 servers. KEMP LoadMaster was configured to terminate SSL connection on the load balancer. The connections to the Exchange servers were also encrypted.<\/p>\n<p>Microsoft Outlook 2013\/2016 clients on PC did not exhibit any issues. Latest Microsoft Outlook for Mac did not exhibit any issues either!<\/p>\n<p>It is worth pointing out that while Outlook 2013\/2016 on PC use MAPI\/HTTP or RPC\/HTTP to connect to Exchange 2013\/2016 servers, both clients on Mac (Mac\u2018s own Mail client and Microsoft Outlook for Mac) uses Exchange Web Services (EWS).<\/p>\n<p>Mac Mail was throwing \u201cAccount Error\u201d which read \u201cUnable to connect \u2026 The server returned error: Connections to host mail.contoso.com on default ports failed.\u201d<\/p>\n<p><a href=\"https:\/\/bhargavs.com\/wp-content\/uploads\/2015\/11\/image.png\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px; border-width: 0px;\" title=\"image\" src=\"https:\/\/bhargavs.com\/wp-content\/uploads\/2015\/11\/image_thumb.png\" alt=\"image\" width=\"244\" height=\"154\" border=\"0\" \/><\/a><\/p>\n<p>The error is somewhat misleading as when you look at EWS logs on Exchange server, you will see that the server responded to the request with HTTP error 400 which translates to \u201cbad request\u201d. What I didn\u2019t know at this point was what was causing the server to respond with this error.<\/p>\n<p>Microsoft provides great testing tools for Exchange on <a href=\"http:\/\/www.exrca.com\">www.exrca.com<\/a>, so I decided to run EWS connectivity test from the toolset. To my surprise, the test failed with the error \u201cMessage: The request failed. The remote server returned an error: (501) Not Implemented.\u201d<\/p>\n<p>I knew about this particular error as I had worked with Michael Van Horenbeeck and is documented here:<\/p>\n<p><a href=\"http:\/\/www.pro-exchange.be\/blogs\/exchange2013\/archive\/2014\/01\/16\/you-get-an-error-the-connection-to-the-server-lt-servername-gt-could-not-be-completed-when-trying-to-start-a-hybrid-mailbox-move-in-exchange-2013.aspx\">You get an error \u201cthe connection to the server &lt;servername&gt; could not be completed\u201d when trying to start a hybrid mailbox move in Exchange 2013<\/a><\/p>\n<p>The issue is also documented by Brian Reid: <a title=\"http:\/\/c7solutions.com\/2014\/06\/exchange-web-services-ews-and-501-error\" href=\"http:\/\/c7solutions.com\/2014\/06\/exchange-web-services-ews-and-501-error\">Exchange Web Services (EWS) and 501 Error<\/a> and Phil Sharp: <a title=\"http:\/\/blog.masteringmsuc.com\/2013\/10\/kemp-load-balancer-and-lync-unified.html\" href=\"http:\/\/blog.masteringmsuc.com\/2013\/10\/kemp-load-balancer-and-lync-unified.html\">Kemp Load Balancer and Lync Unified Contact Store Integration Note<\/a>.<\/p>\n<p>After enabling L7 debug tracing on my KEMP LoadMaster I observed the same error mentioned in the above articles \u201clb100 kernel: L7: badrequest-client_read [client.ip.address:51830-&gt;load.balancer.ip.address:443] (-501): &lt;?xml ? , 0 [hlen 1405, nhdrs 11]\u201d<\/p>\n<p>It would be easy to blame load balancer at this point and implement the recommended fix by changing 100-continue handling on LoadMaster. But if that was the issue, why did Outlook for Mac work without any errors?<\/p>\n<p>Anyhow, I proceeded changing the 100-continue handling by changing it from default setting of RFC-2616 compliant, to RFC-7231 compliant instead:<\/p>\n<p><a href=\"https:\/\/bhargavs.com\/wp-content\/uploads\/2015\/11\/image1.png\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px; border-width: 0px;\" title=\"image\" src=\"https:\/\/bhargavs.com\/wp-content\/uploads\/2015\/11\/image_thumb1.png\" alt=\"image\" width=\"244\" height=\"144\" border=\"0\" \/><\/a><\/p>\n<p>After changing this setting, I ran the EWS test from exrca website again, and as one would expect, the test passed with no issues.<\/p>\n<p>It did, however, failed to address the issue for Mac Mail client! No eureka moment, just yet!<\/p>\n<p>I will cover details of further troubleshooting in <a href=\"http:\/\/www.bhargavs.com\/index.php\/2015\/11\/05\/mac-mail-not-connecting-to-exchange-server-part-2\/\">second part<\/a> of this article. You can read it <a href=\"http:\/\/www.bhargavs.com\/index.php\/2015\/11\/05\/mac-mail-not-connecting-to-exchange-server-part-2\/\">here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>My good friend and renowned Exchange MVP Jeff Guillet (expta.com fame) brought an interesting issue to my attention. On his Mac, built-in Mail client would not connect to Exchange through [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[55],"tags":[67,70,119,123,124,128,152,153,162],"class_list":["post-1115","post","type-post","status-publish","format-standard","hentry","category-exchange-2016","tag-400-bad-request","tag-501-not-implemented","tag-ews","tag-exchange-2013","tag-exchange-2016","tag-exchange-web-services","tag-load-balancer","tag-loadmaster","tag-mac-mail"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mac Mail not connecting to Exchange Server - Part 1 - Bhargav&#039;s IT Playground<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/bhargavs.com\/index.php\/2015\/11\/04\/mac-mail-not-connecting-to-exchange-server-part-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mac Mail not connecting to Exchange Server - Part 1 - Bhargav&#039;s IT Playground\" \/>\n<meta property=\"og:description\" content=\"My good friend and renowned Exchange MVP Jeff Guillet (expta.com fame) brought an interesting issue to my attention. 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