{"id":3390,"date":"2025-01-27T07:25:31","date_gmt":"2025-01-27T07:25:31","guid":{"rendered":"https:\/\/www.it-react.com\/?p=3390"},"modified":"2025-01-27T10:09:09","modified_gmt":"2025-01-27T10:09:09","slug":"debugging-and-resolving-vcenter-access-issues-due-to-expired-certificates","status":"publish","type":"post","link":"https:\/\/www.it-react.com\/index.php\/2025\/01\/27\/debugging-and-resolving-vcenter-access-issues-due-to-expired-certificates\/","title":{"rendered":"Debugging and Resolving vCenter Access Issues Due to Expired Certificates"},"content":{"rendered":"\n<p>Recently, I encountered an issue where I was unable to access the vCenter web interface in my Test-Lab, after restoring to a pretty old Snapshot. Upon attempting to log in, I was met with the errors &#8220;No healthy upstream&#8221; and &#8220;503 &#8211; Service Not Available&#8221; on the management interface. This blog post outlines how I debugged and resolved this issue, which turned out to be caused by an expired certificate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Initial Debugging Steps<\/strong><\/h2>\n\n\n\n<p>When faced with the above errors, the first step is to identify the root cause. Here are the steps I followed to debug the issue:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Check <span style=\"text-transform: none;\">vCenter<\/span> Services<\/strong><\/h3>\n\n\n\n<p>Using SSH access to the vCenter Server Appliance (VCSA), I verified the status of all vCenter services:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>service-control --status<\/code><\/pre>\n\n\n\n<p>I found that some services were not running or were in a degraded state.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"901\" height=\"580\" src=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik.png\" alt=\"\" class=\"wp-image-3408\" srcset=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik.png 901w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-300x193.png 300w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-768x494.png 768w\" sizes=\"auto, (max-width: 901px) 100vw, 901px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong><strong>Step 2:<\/strong> Review Logs<\/strong><\/h3>\n\n\n\n<p>Logs are an essential resource for debugging. I examined the following logs for clues:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>vCenter server logs:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>tail -f \/var\/log\/vmware\/vpxd\/vpxd.log<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Appliance management logs:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>tail -f \/var\/log\/vmware\/applmgmt\/applmgmt.log<\/code><\/pre>\n\n\n\n<p>In the <code>applmgmt.log<\/code>, I found entries indicating issues with expired certificates:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"261\" src=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-1-1024x261.png\" alt=\"\" class=\"wp-image-3409\" srcset=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-1-1024x261.png 1024w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-1-300x77.png 300w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-1-768x196.png 768w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-1.png 1026w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>DEBUG:vmware.appliance.extensions.authentication.authentication_sso:isExpired, notBefore: 2023-11-02T15:33:46.646Z, notOnOrAfter: 2023-11-05T15:33:46.646Z, now: 2023-11-02 15:53:23.014211<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong><strong>Step 3:<\/strong> Check All Certificates on VCSA<\/strong><\/h3>\n\n\n\n<p>Using the following command, I listed and inspected all the certificates on the VCSA:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>for store in $(\/usr\/lib\/vmware-vmafd\/bin\/vecs-cli store list | grep -v TRUSTED_ROOT_CRLS); do \\\necho \"&#91;*] Store :\" $store; \\\n\/usr\/lib\/vmware-vmafd\/bin\/vecs-cli entry list --store $store --text | grep -ie \"Alias\" -ie \"Not After\"; \\\ndone;<\/code><\/pre>\n\n\n\n<p>This command iterates through all certificate stores and lists details for each certificate, helping identify any that have expired. I&#8217;ve noticed some certificates were expired, so I have to regenerate them in order to be able to access vCenter again.<br><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"585\" height=\"1024\" src=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-2-585x1024.png\" alt=\"\" class=\"wp-image-3414\" srcset=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-2-585x1024.png 585w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-2-172x300.png 172w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-2.png 646w\" sizes=\"auto, (max-width: 585px) 100vw, 585px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Generating and Applying a Self-Signed Certificate<\/strong><\/h2>\n\n\n\n<p>To resolve the issue, I replaced the expired certificates with new self-signed certificates. Here are the steps I followed:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Access the Certificate Manager<\/strong><\/h3>\n\n\n\n<p>Start Certificate Manager using this command<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/usr\/lib\/vmware-vmca\/bin\/certificate-manager<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: Select the Reset All Certificates Option<\/strong><\/h3>\n\n\n\n<p>From the menu, select <strong>Option 8<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Reset all Certificates<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 3: <strong>Generate the Certificate<\/strong><\/strong><\/h3>\n\n\n\n<p>The Certificate Manager tool prompts you to confirm that you want to generate all the certificates.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 4: <strong>Provide Administrator Credentials<\/strong><\/strong><\/h3>\n\n\n\n<p>Enter the SSO administrator username (e.g., <code>administrator@vsphere.local<\/code>) and password. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"698\" src=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-3-1024x698.png\" alt=\"\" class=\"wp-image-3419\" srcset=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-3-1024x698.png 1024w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-3-300x204.png 300w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-3-768x523.png 768w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-3.png 1215w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>After entering al the details for the certificate, I had to confirm if I want to regenerate Root Certificate and replace all certificates using VMCA.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"45\" src=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-5-1024x45.png\" alt=\"\" class=\"wp-image-3421\" srcset=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-5-1024x45.png 1024w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-5-300x13.png 300w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-5-768x34.png 768w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-5.png 1259w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The certificates were successfully replaced and the services were restarted.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"986\" height=\"37\" src=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-6.png\" alt=\"\" class=\"wp-image-3423\" srcset=\"https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-6.png 986w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-6-300x11.png 300w, https:\/\/www.it-react.com\/wp-content\/uploads\/2025\/01\/grafik-6-768x29.png 768w\" sizes=\"auto, (max-width: 986px) 100vw, 986px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Verifying the Fix<\/strong><\/h2>\n\n\n\n<p>After completing the steps above, I verified that the vCenter web interface was accessible:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Open a browser and navigate to the vCenter URL (e.g., <code>https:\/\/&lt;vcenter-fqdn><\/code>).<\/li>\n\n\n\n<li>Check the SSL certificate details to confirm the issuer and validity period.<\/li>\n\n\n\n<li>Log in to ensure all services are operational.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Lessons Learned<\/strong><\/h2>\n\n\n\n<p>While this issue occurred in a lab environment and was not critical for me, as I had restored an old snapshot and was aware this might happen, it is important to implement mechanisms to avoid such problems in production environments. Here are some best practices:<\/p>\n\n\n\n<p>This issue highlighted the importance of monitoring and managing certificates in vSphere environments. To avoid similar problems in the future:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Regularly check certificate expiration dates.<\/li>\n\n\n\n<li>Set up alerts for certificate renewal in your monitoring tools.<\/li>\n\n\n\n<li>Consider using custom certificates if required by your organization\u2019s policies.<\/li>\n<\/ul>\n\n\n\n<p>By following these steps, I was able to restore access to the vCenter and ensure uninterrupted management of the virtual infrastructure. If you encounter similar issues, I hope this guide helps you resolve them efficiently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p>Here are some resources that were helpful during the process:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a class=\"effect1\" href=\"https:\/\/knowledge.broadcom.com\/external\/article\/344201\/verify-and-resolve-expired-vcenter-serve.html\">Verify and resolve expired vCenter Server certificates using command line interface<\/a><\/li>\n\n\n\n<li><a class=\"effect1\" href=\"https:\/\/knowledge.broadcom.com\/external\/article\/343041\/determining-expired-ssl-certificates-in.html\">Determining expired SSL certificates in vCenter Server and ESXi 6.x and 7.0.x<\/a><\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently, I encountered an issue where I was unable to access the vCenter web interface in my Test-Lab, after restoring to a pretty old Snapshot. Upon attempting to log in, I was met with the errors &#8220;No healthy upstream&#8221; and &#8220;503 &#8211; Service Not Available&#8221; on the management interface. This blog post outlines how I [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3435,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_FSMCFIC_featured_image_caption":"","_FSMCFIC_featured_image_nocaption":"","_FSMCFIC_featured_image_hide":"","footnotes":""},"categories":[15],"tags":[34,25,26,36],"class_list":["post-3390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vmware","tag-certificates","tag-vcenter","tag-vmware","tag-vsphere"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Debugging and Resolving vCenter Access Issues Due to Expired Certificates - IT-REACT<\/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:\/\/www.it-react.com\/index.php\/2025\/01\/27\/debugging-and-resolving-vcenter-access-issues-due-to-expired-certificates\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Debugging and Resolving vCenter Access Issues Due to Expired Certificates - IT-REACT\" \/>\n<meta property=\"og:description\" content=\"Recently, I encountered an issue where I was unable to access the vCenter web interface in my Test-Lab, after restoring to a pretty old Snapshot. 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