Currently the farm is suffering from xrootd proxy issue, yet to be identified? Symptoms are high CLOSE_WAIT connection value. Previously it’s been identified that more than ~400 CLOSE_WAIT connections causes xrootd to act erratically.
As of 16/11/23:
lcg2631
lcg2635
lcg2638
lcg2617
The above nodes how this xrootd proxy issue.