{"id":9949,"date":"2026-06-07T21:43:49","date_gmt":"2026-06-07T19:43:49","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=9949"},"modified":"2026-06-07T21:43:50","modified_gmt":"2026-06-07T19:43:50","slug":"eroare-gmail-in-timpul-verificarii-certificatului-serverului-de-e-mail-negocierea-tls-a-esuat","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/","title":{"rendered":"Eroare Gmail \u00een timpul verific\u0103rii certificatului serverului de e-mail (TLS Negotiation Failed)"},"content":{"rendered":"<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">Due to changes introduced by Google regarding the use of external SMTP servers with Gmail accounts, you may occasionally encounter an error similar to:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TLS Negotiation failed\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">or a message indicating that Gmail could not verify the mail server&#8217;s security certificate.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#Cause_of_the_Problem\" >Cause of the Problem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#Verify_Gmail_SMTP_Settings\" >Verify Gmail SMTP Settings<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#Recommended_SMTP_Configuration\" >Recommended SMTP Configuration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#Example_Configuration\" >Example Configuration<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#Important_Notes\" >Important Notes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#If_the_Problem_Persists\" >If the Problem Persists<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/ro\/knowledgebase\/gmail-error-during-mail-server-certificate-verification-tls-negotiation-failed\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cause_of_the_Problem\"><\/span>Cause of the Problem<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-2357995496\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Acces timpuriu<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Mai ave\u021bi nevoie de ajutor?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contacta\u021bi echipa noastr\u0103 de servicii pentru clien\u021bi.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Trimite mesaj<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">This error typically occurs when Gmail cannot establish a secure TLS connection with the outgoing mail server configured for the account.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common causes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Incorrect SMTP server settings<\/li>\n\n\n\n<li>An incorrect SMTP port<\/li>\n\n\n\n<li>An unsupported encryption method<\/li>\n\n\n\n<li>Temporary connectivity issues<\/li>\n\n\n\n<li>Certificate validation problems<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Verify_Gmail_SMTP_Settings\"><\/span>Verify Gmail SMTP Settings<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To check your outgoing mail server configuration, open Gmail settings:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>https:&#47;&#47;mail.google.com\/mail\/u\/0\/#settings\/accounts\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Navigate to:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Settings \u2192 Accounts and Import \u2192 Send mail as\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Locate the affected email account and click:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Edit info\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">or<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Edit SMTP server\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Recommended_SMTP_Configuration\"><\/span>Recommended SMTP Configuration<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Make sure the following settings are configured correctly:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Setting<\/th><th>Value<\/th><\/tr><\/thead><tbody><tr><td>SMTP Server<\/td><td><code>smtp.mybox.com<\/code><\/td><\/tr><tr><td>Port<\/td><td><code>587<\/code><\/td><\/tr><tr><td>Connection Security<\/td><td><code>TLS<\/code><\/td><\/tr><tr><td>Username<\/td><td>Full email address<\/td><\/tr><tr><td>Password<\/td><td>Mailbox password<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example_Configuration\"><\/span>Example Configuration<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>SMTP Server: smtp.mybox.com\nPort: 587\nSecurity: TLS\nUsername: your-email@yourdomain.com\nPassword: mailbox password\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Important_Notes\"><\/span>Important Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do not use SSL when port <strong>587<\/strong> is selected.<\/li>\n\n\n\n<li>Ensure that the full email address is entered as the username.<\/li>\n\n\n\n<li>Verify that the mailbox password is correct.<\/li>\n\n\n\n<li>If you recently changed DNS, MX, or SSL-related settings, allow time for propagation.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"If_the_Problem_Persists\"><\/span>If the Problem Persists<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If Gmail still reports a TLS negotiation or certificate verification error:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Remove the external account from Gmail.<\/li>\n\n\n\n<li>Re-add the account using the correct SMTP settings.<\/li>\n\n\n\n<li>Verify that the mail server certificate is valid and up to date.<\/li>\n\n\n\n<li>Test sending mail using a desktop email client such as Outlook or Thunderbird.<\/li>\n\n\n\n<li>Contact your hosting provider to verify that the SMTP service is operating correctly.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When Gmail reports a <strong>TLS Negotiation Failed<\/strong> or certificate verification error, first verify that the outgoing mail server is configured as:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Server: smtp.mybox.com\nPort: 587\nEncryption: TLS\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">In most cases, correcting the SMTP server, port, or encryption settings resolves the issue and allows Gmail to send messages successfully through the external mailbox.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[24],"manual_kb_tag":[4049,4368,4447,4448,4449,4450,4451,800,1399,2173],"class_list":["post-9949","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-gmail","manual_kb_tag-tls-encryption","manual_kb_tag-starttls","manual_kb_tag-gmail-error","manual_kb_tag-negotiation-failed","manual_kb_tag-certificate-verification","manual_kb_tag-mail-server-certificate","manual_kb_tag-port-58","manual_kb_tag-smtp-server","manual_kb_tag-smtp-settings","manual_kb_tag-outgoing-mail-server"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/9949","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/9949\/revisions"}],"predecessor-version":[{"id":9950,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb\/9949\/revisions\/9950"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/media?parent=9949"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manualknowledgebasecat?post=9949"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/ro\/wp-json\/wp\/v2\/manual_kb_tag?post=9949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}