Cleanup closed connection when client disconnects.

[taeold]

Fixes #5346

(Thank you @beezital)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.20%. Comparing base (254dc8b) to head (289e07b).
⚠️ Report is 1712 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5783      +/-   ##
==========================================
+ Coverage   55.18%   55.20%   +0.02%     
==========================================
  Files         329      329              
  Lines       22527    22534       +7     
  Branches     4590     4591       +1     
==========================================
+ Hits        12432    12441       +9     
+ Misses       8990     8989       -1     
+ Partials     1105     1104       -1     

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