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I have two accounts on Thunderbird - both have always worked. One of them has now stopped receiving emails saying "Failed to connect to server imap.gmail.com

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Troubleshoot Output

 Application Basics
   Name: Thunderbird
   Version: 52.7.0
   User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0
   Profile Folder: Open Folder
             (Local drive)
   Application Build ID: 20180322145026
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory
   Profiles: about:profiles
 Mail and News Accounts
   account1:
     INCOMING: account1, , (imap) imap.gmail.com:993, SSL, OAuth2
     OUTGOING: , smtp.gmail.com:465, SSL, OAuth2, true
   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext
   account3:
     INCOMING: account3, , (imap) mail.webfaction.com:143, alwaysSTARTTLS, passwordCleartext
     OUTGOING: , smtp.webfaction.com:587, alwaysSTARTTLS, passwordEncrypted, true
 Crash Reports
 Extensions
   gContactSync, 2.0.12, true, gContactSync@pirules.net
   Lightning, 5.4.7, true, {e2fda1a4-762b-4020-b5ad-a41df1933103}
 Important Modified Preferences
   Name: Value
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     extensions.lastAppVersion: 52.7.0
     font.name.monospace.el: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 17
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 68c66d3c-8c58-45b8-b61c-4d6074d2bc9
     mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false…
     media.gmp.storage.version.observed: 1
     network.cookie.prefsMigrated: true
     network.predictor.cleaned-up: true
     places.database.lastMaintenance: 1524185257
     places.history.expiration.transient_current_max_pages: 122334
     security.sandbox.content.tempDirSuffix: {bffce484-ef9c-469b-93bc-7109720c3f13}
 Graphics
     GPU #1
     Description: Intel(R) HD Graphics 5500
     Vendor ID: 0x8086
     Device ID: 0x1616
     RAM: Unknown
     Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32
     Driver Version: 20.19.15.4531
     Driver Date: 9-29-2016
     Features
     Direct2D: false
     DirectWrite: true (10.0.16299.334)
     WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 5500 Direct3D9Ex vs_3_0 ps_3_0) -- OpenGL ES 2.0 (ANGLE 2.1.0.2a250c8a0e15)
     AzureCanvasBackend: skia
     AzureCanvasAccelerated: 0
     AzureFallbackCanvasBackend: cairo
     AzureContentBackend: skia
 JavaScript
 Incremental GC: 1
 Accessibility
   Activated: 0
   Prevent Accessibility: 0
 Library Versions
     Expected minimum version
     Version in use
     NSPR
     4.13.1
     4.13.1
     NSS
     3.28.6
     3.28.6
     NSS Util
     3.28.6
     3.28.6
     NSS SSL
     3.28.6
     3.28.6
     NSS S/MIME
     3.28.6
     3.28.6
Troubleshoot Output Application Basics Name: Thunderbird Version: 52.7.0 User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 Profile Folder: Open Folder (Local drive) Application Build ID: 20180322145026 Enabled Plugins: about:plugins Build Configuration: about:buildconfig Memory Use: about:memory Profiles: about:profiles Mail and News Accounts account1: INCOMING: account1, , (imap) imap.gmail.com:993, SSL, OAuth2 OUTGOING: , smtp.gmail.com:465, SSL, OAuth2, true account2: INCOMING: account2, , (none) Local Folders, plain, passwordCleartext account3: INCOMING: account3, , (imap) mail.webfaction.com:143, alwaysSTARTTLS, passwordCleartext OUTGOING: , smtp.webfaction.com:587, alwaysSTARTTLS, passwordEncrypted, true Crash Reports Extensions gContactSync, 2.0.12, true, gContactSync@pirules.net Lightning, 5.4.7, true, {e2fda1a4-762b-4020-b5ad-a41df1933103} Important Modified Preferences Name: Value browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 extensions.lastAppVersion: 52.7.0 font.name.monospace.el: Consolas font.name.monospace.x-cyrillic: Consolas font.name.monospace.x-unicode: Consolas font.name.monospace.x-western: Consolas font.name.sans-serif.el: Calibri font.name.sans-serif.x-cyrillic: Calibri font.name.sans-serif.x-unicode: Calibri font.name.sans-serif.x-western: Calibri font.name.serif.el: Cambria font.name.serif.x-cyrillic: Cambria font.name.serif.x-unicode: Cambria font.name.serif.x-western: Cambria font.size.fixed.el: 14 font.size.fixed.x-cyrillic: 14 font.size.fixed.x-unicode: 14 font.size.fixed.x-western: 14 font.size.variable.el: 17 font.size.variable.x-cyrillic: 17 font.size.variable.x-unicode: 17 font.size.variable.x-western: 17 mail.openMessageBehavior.version: 1 mail.winsearch.firstRunDone: true mailnews.database.global.datastore.id: 68c66d3c-8c58-45b8-b61c-4d6074d2bc9 mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"3"},"attachmentCol":{"visible":false… media.gmp.storage.version.observed: 1 network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1524185257 places.history.expiration.transient_current_max_pages: 122334 security.sandbox.content.tempDirSuffix: {bffce484-ef9c-469b-93bc-7109720c3f13} Graphics GPU #1 Description: Intel(R) HD Graphics 5500 Vendor ID: 0x8086 Device ID: 0x1616 RAM: Unknown Drivers: igdumdim64 igd10iumd64 igd10iumd64 igd12umd64 igdumdim32 igd10iumd32 igd10iumd32 igd12umd32 Driver Version: 20.19.15.4531 Driver Date: 9-29-2016 Features Direct2D: false DirectWrite: true (10.0.16299.334) WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 5500 Direct3D9Ex vs_3_0 ps_3_0) -- OpenGL ES 2.0 (ANGLE 2.1.0.2a250c8a0e15) AzureCanvasBackend: skia AzureCanvasAccelerated: 0 AzureFallbackCanvasBackend: cairo AzureContentBackend: skia JavaScript Incremental GC: 1 Accessibility Activated: 0 Prevent Accessibility: 0 Library Versions Expected minimum version Version in use NSPR 4.13.1 4.13.1 NSS 3.28.6 3.28.6 NSS Util 3.28.6 3.28.6 NSS SSL 3.28.6 3.28.6 NSS S/MIME 3.28.6 3.28.6

Todas las respuestas (1)

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It looks like somehow your 2nd GMail account has lost its configuration:

Mail and News Accounts

  • account2:
    • INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

I'd suggest removing it completely and creating it again.

This link is useful to better understand how GMail can be used in Thunderbird.