Found following error repeatedly on multiple servers tonight.
Ping ocsp.comodoca.com got duplicate packets:
[Tue Apr 03 21:21:01.410040 2018] [ssl:error] [pid 58447:tid 139759879960320] (111)Connection refused: [client 66.249.79.119:64552] AH01974: could not connect to OCSP responder 'ocsp.comodoca.com'
[Tue Apr 03 21:21:01.410083 2018] [ssl:error] [pid 58447:tid 139759879960320] AH01941: stapling_renew_response: responder error
[Tue Apr 03 21:21:01.410083 2018] [ssl:error] [pid 58447:tid 139759879960320] AH01941: stapling_renew_response: responder error
Ping ocsp.comodoca.com got duplicate packets:
PING ocsp.comodoca.com (178.255.83.1) 56(84) bytes of data.
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=2 ttl=58 time=4.77 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=2 ttl=58 time=4.77 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=2 ttl=58 time=4.89 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=3 ttl=58 time=5.09 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=3 ttl=58 time=5.09 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=3 ttl=58 time=5.09 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=4 ttl=58 time=4.54 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=4 ttl=58 time=4.62 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=4 ttl=58 time=4.62 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=5 ttl=58 time=4.54 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=5 ttl=58 time=4.54 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=5 ttl=58 time=4.54 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=6 ttl=58 time=4.83 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=6 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=6 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=7 ttl=58 time=4.74 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=7 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=7 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=8 ttl=58 time=4.83 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=8 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=8 ttl=58 time=4.95 ms (DUP!)
^C
--- ocsp.comodoca.com ping statistics ---
8 packets transmitted, 7 received, +14 duplicates, 12% packet loss, time 7008ms
rtt min/avg/max/mdev = 4.540/4.794/5.099/0.180 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=2 ttl=58 time=4.77 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=2 ttl=58 time=4.77 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=2 ttl=58 time=4.89 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=3 ttl=58 time=5.09 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=3 ttl=58 time=5.09 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=3 ttl=58 time=5.09 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=4 ttl=58 time=4.54 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=4 ttl=58 time=4.62 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=4 ttl=58 time=4.62 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=5 ttl=58 time=4.54 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=5 ttl=58 time=4.54 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=5 ttl=58 time=4.54 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=6 ttl=58 time=4.83 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=6 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=6 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=7 ttl=58 time=4.74 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=7 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=7 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=8 ttl=58 time=4.83 ms
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=8 ttl=58 time=4.83 ms (DUP!)
64 bytes from ocsp.comodoca.com (178.255.83.1): icmp_seq=8 ttl=58 time=4.95 ms (DUP!)
^C
--- ocsp.comodoca.com ping statistics ---
8 packets transmitted, 7 received, +14 duplicates, 12% packet loss, time 7008ms
rtt min/avg/max/mdev = 4.540/4.794/5.099/0.180 ms