diff --git a/autoload/ale/definition.vim b/autoload/ale/definition.vim
index b20c01a..521cd0b 100644
--- a/autoload/ale/definition.vim
+++ b/autoload/ale/definition.vim
@@ -19,6 +19,10 @@ function! ale#definition#Execute(expr) abort
     execute a:expr
 endfunction
 
+function! ale#definition#ClearLSPData() abort
+    let s:go_to_definition_map = {}
+endfunction
+
 function! ale#definition#Open(options, filename, line, column) abort
     if a:options.open_in_tab
         call ale#definition#Execute('tabedit ' . fnameescape(a:filename))
diff --git a/autoload/ale/engine.vim b/autoload/ale/engine.vim
index 6ccc3a3..8916987 100644
--- a/autoload/ale/engine.vim
+++ b/autoload/ale/engine.vim
@@ -76,6 +76,11 @@ function! ale#engine#InitBufferInfo(buffer) abort
     return 0
 endfunction
 
+" Clear LSP linter data for the linting engine.
+function! ale#engine#ClearLSPData() abort
+    let s:lsp_linter_map = {}
+endfunction
+
 " This function is documented and part of the public API.
 "
 " Return 1 if ALE is busy checking a given buffer
@@ -144,7 +149,7 @@ function! s:GatherOutput(job_id, line) abort
     endif
 endfunction
 
-function! s:HandleLoclist(linter_name, buffer, loclist) abort
+function! ale#engine#HandleLoclist(linter_name, buffer, loclist) abort
     let l:info = get(g:ale_buffer_info, a:buffer, {})
 
     if empty(l:info)
@@ -223,7 +228,7 @@ function! s:HandleExit(job_id, exit_code) abort
 
     let l:loclist = ale#util#GetFunction(l:linter.callback)(l:buffer, l:output)
 
-    call s:HandleLoclist(l:linter.name, l:buffer, l:loclist)
+    call ale#engine#HandleLoclist(l:linter.name, l:buffer, l:loclist)
 endfunction
 
 function! s:HandleLSPDiagnostics(conn_id, response) abort
@@ -237,7 +242,7 @@ function! s:HandleLSPDiagnostics(conn_id, response) abort
 
     let l:loclist = ale#lsp#response#ReadDiagnostics(a:response)
 
-    call s:HandleLoclist(l:linter_name, l:buffer, l:loclist)
+    call ale#engine#HandleLoclist(l:linter_name, l:buffer, l:loclist)
 endfunction
 
 function! s:HandleTSServerDiagnostics(response, error_type) abort
@@ -262,7 +267,7 @@ function! s:HandleTSServerDiagnostics(response, error_type) abort
     let l:loclist = get(l:info, 'semantic_loclist', [])
     \   + get(l:info, 'syntax_loclist', [])
 
-    call s:HandleLoclist('tsserver', l:buffer, l:loclist)
+    call ale#engine#HandleLoclist('tsserver', l:buffer, l:loclist)
 endfunction
 
 function! s:HandleLSPErrorMessage(error_message) abort
diff --git a/autoload/ale/lsp.vim b/autoload/ale/lsp.vim
index 126d6c1..8db9348 100644
--- a/autoload/ale/lsp.vim
+++ b/autoload/ale/lsp.vim
@@ -325,6 +325,20 @@ function! ale#lsp#ConnectToAddress(address, project_root, callback) abort
     return 1
 endfunction
 
+" Stop all LSP connections, closing all jobs and channels, and removing any
+" queued messages.
+function! ale#lsp#StopAll() abort
+    for l:conn in s:connections
+        if has_key(l:conn, 'channel')
+            call ch_close(l:conn.channel)
+        else
+            call ale#job#Stop(l:conn.id)
+        endif
+    endfor
+
+    let s:connections = []
+endfunction
+
 function! s:SendMessageData(conn, data) abort
     if has_key(a:conn, 'executable')
         call ale#job#SendRaw(a:conn.id, a:data)
diff --git a/autoload/ale/lsp/reset.vim b/autoload/ale/lsp/reset.vim
new file mode 100644
index 0000000..c206ed0
--- /dev/null
+++ b/autoload/ale/lsp/reset.vim
@@ -0,0 +1,25 @@
+" Stop all LSPs and remove all of the data for them.
+function! ale#lsp#reset#StopAllLSPs() abort
+    call ale#lsp#StopAll()
+
+    if exists('*ale#definition#ClearLSPData')
+        " Clear the mapping for connections, etc.
+        call ale#definition#ClearLSPData()
+    endif
+
+    if exists('*ale#engine#ClearLSPData')
+        " Clear the mapping for connections, etc.
+        call ale#engine#ClearLSPData()
+
+        " Remove the problems for all of the LSP linters in every buffer.
+        for l:buffer_string in keys(g:ale_buffer_info)
+            let l:buffer = str2nr(l:buffer_string)
+
+            for l:linter in ale#linter#Get(getbufvar(l:buffer, '&filetype'))
+                if !empty(l:linter.lsp)
+                    call ale#engine#HandleLoclist(l:linter.name, l:buffer, [])
+                endif
+            endfor
+        endfor
+    endif
+endfunction
diff --git a/doc/ale.txt b/doc/ale.txt
index 95c3c0e..2e98cd7 100644
--- a/doc/ale.txt
+++ b/doc/ale.txt
@@ -1871,6 +1871,15 @@ ALEResetBuffer                                                 *ALEResetBuffer*
   |ALEDisableBuffer|.
 
 
+ALEStopAllLSPs                                                 *ALEStopAllLSPs*
+
+  `ALEStopAllLSPs` will close and stop all channels and jobs for all LSP-like
+  clients, including tsserver, remove all of the data stored for them, and
+  delete all of the problems found for them, updating every linted buffer.
+
+  This command can be used when LSP clients mess up and need to be restarted.
+
+
 ===============================================================================
 9. API                                                                *ale-api*
 
diff --git a/plugin/ale.vim b/plugin/ale.vim
index 69c0849..1aa3582 100644
--- a/plugin/ale.vim
+++ b/plugin/ale.vim
@@ -249,6 +249,8 @@ command! -bar ALEToggleBuffer :call ale#toggle#ToggleBuffer(bufnr(''))
 command! -bar ALEEnableBuffer :call ale#toggle#EnableBuffer(bufnr(''))
 command! -bar ALEDisableBuffer :call ale#toggle#DisableBuffer(bufnr(''))
 command! -bar ALEResetBuffer :call ale#toggle#ResetBuffer(bufnr(''))
+" A command to stop all LSP-like clients, including tsserver.
+command! -bar ALEStopAllLSPs :call ale#lsp#reset#StopAllLSPs()
 
 " A command for linting manually.
 command! -bar ALELint :call ale#Queue(0, 'lint_file')
diff --git a/test/lsp/test_reset_lsp.vader b/test/lsp/test_reset_lsp.vader
new file mode 100644
index 0000000..2bec13d
--- /dev/null
+++ b/test/lsp/test_reset_lsp.vader
@@ -0,0 +1,90 @@
+Before:
+  Save g:ale_enabled
+  Save g:ale_set_signs
+  Save g:ale_set_quickfix
+  Save g:ale_set_loclist
+  Save g:ale_set_highlights
+  Save g:ale_echo_cursor
+
+  let g:ale_enabled = 0
+  let g:ale_set_signs = 0
+  let g:ale_set_quickfix = 0
+  let g:ale_set_loclist = 0
+  let g:ale_set_highlights = 0
+  let g:ale_echo_cursor = 0
+
+  function EmptyString() abort
+    return ''
+  endfunction
+
+  call ale#engine#InitBufferInfo(bufnr(''))
+
+  call ale#linter#Define('testft', {
+  \   'name': 'lsplinter',
+  \   'lsp': 'tsserver',
+  \   'executable_callback': 'EmptyString',
+  \   'command_callback': 'EmptyString',
+  \   'project_root_callback': 'EmptyString',
+  \   'language_callback': 'EmptyString',
+  \})
+
+  call ale#linter#Define('testft', {
+  \ 'name': 'otherlinter',
+  \ 'callback': 'TestCallback',
+  \ 'executable': has('win32') ? 'cmd': 'true',
+  \ 'command': 'true',
+  \ 'read_buffer': 0,
+  \})
+
+After:
+  Restore
+
+  unlet! b:ale_save_event_fired
+
+  delfunction EmptyString
+  call ale#linter#Reset()
+
+Given testft(Some file with an imaginary filetype):
+Execute(ALEStopAllLSPs should clear the loclist):
+  let g:ale_buffer_info[bufnr('')].loclist = [
+  \ {
+  \   'text': 'a',
+  \   'lnum': 10,
+  \   'col': 0,
+  \   'bufnr': bufnr(''),
+  \   'vcol': 0,
+  \   'type': 'E',
+  \   'nr': -1,
+  \   'linter_name': 'lsplinter',
+  \ },
+  \ {
+  \   'text': 'a',
+  \   'lnum': 10,
+  \   'col': 0,
+  \   'bufnr': bufnr(''),
+  \   'vcol': 0,
+  \   'type': 'E',
+  \   'nr': -1,
+  \   'linter_name': 'otherlinter',
+  \ },
+  \]
+  let g:ale_buffer_info[bufnr('')].active_linter_list = ['lsplinter', 'otherlinter']
+
+  ALEStopAllLSPs
+
+  " The loclist should be updated.
+  AssertEqual g:ale_buffer_info[bufnr('')].loclist, [
+  \ {
+  \   'text': 'a',
+  \   'lnum': 10,
+  \   'col': 0,
+  \   'bufnr': bufnr(''),
+  \   'vcol': 0,
+  \   'type': 'E',
+  \   'nr': -1,
+  \   'linter_name': 'otherlinter',
+  \ },
+  \]
+
+  " The LSP linter should be removed from the active linter list.
+  AssertEqual g:ale_buffer_info[bufnr('')].active_linter_list, ['otherlinter']