I'm still having this issue and I can't figure it out.
Sometimes, I have problems logging into the web interface for several minutes in a row, and then suddenly it will start working fine.
Here are some more details:
/opt/zimbra/log/nginx.log - These errors show up over and over
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2021/07/15 09:49:24 [error] 3465#0: reconnect to memcached channel <myserverpublicIPaddress>:11211 fails
2021/07/15 09:49:24 [notice] 3465#0: memcached channel:<myserverpublicIPaddress>:11211 down, reconnect after:60000 ms
2021/07/15 09:49:25 [notice] 3464#0: reconnect to memcached channel <myserverpublicIPaddress>:11211 (rc: -2)
2021/07/15 09:49:25 [error] 3464#0: recv() failed (111: Connection refused)
/opt/zimbra/log/nginx.access.log - These errors show up over and over when I try to access the web interface.
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222.166.95.4:42766 - - [15/Jul/2021:09:21:48 +0800] "GET https://<myserverpublicDNSname>/js/JQuery_all.js.zgz?v=210621064822 HTTP/2.0" 200 32079 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "<myserverpublicIPaddress>:8443" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:48 +0800] "GET https://<myserverpublicDNSname>/js/Startup1_1_all.js.zgz?v=210621064822 HTTP/2.0" 200 194878 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "<myserverpublicIPaddress>:8443" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:48 +0800] "GET https://<myserverpublicDNSname>/js/Startup1_2_all.js.zgz?v=210621064822 HTTP/2.0" 502 1245 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:49 +0800] "GET https://<myserverpublicDNSname>/res/I18nMsg,TzMsg,AjxMsg,ZMsg,ZmMsg,AjxKeys,ZmKeys,ZdMsg,AjxTemplateMsg.js.zgz?v=210621064822&debug=false&language=en&country=US&skin=harmony HTTP/2.0" 200 72740 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "<myserverpublicIPaddress>:8443" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:49 +0800] "GET https://<myserverpublicDNSname>/img/zimbra.gif?v=210621064822 HTTP/2.0" 502 1245 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:49 +0800] "HEAD https://<myserverpublicDNSname>/public/blank.html?_=1626312109000 HTTP/2.0" 502 77 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:49 +0800] "GET https://<myserverpublicDNSname>/img/zimbra.png?v=210621064822 HTTP/2.0" 502 1245 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:49 +0800] "GET https://<myserverpublicDNSname>/js/Startup1_2_all.js.zgz?v=210621064822 HTTP/2.0" 502 1245 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:21:49 +0800] "GET https://<myserverpublicDNSname>/img/logo/favicon.ico;jsessionid=node0al0cpwr0ccwfruuf2ws7mcwu5.node0 HTTP/2.0" 502 1245 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "" "<myserverpublicIPaddress>:443"
222.166.95.4:42766 - - [15/Jul/2021:09:22:16 +0800] "GET https://<myserverpublicDNSname>/ HTTP/2.0" 200 40737 "https://<myserverpublicDNSname>/" "Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0" "<myserverpublicIPaddress>:8443" "<myserverpublicIPaddress>:443"
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zimbra@mail:~$ lsof -i :443
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
nginx 3464 zimbra 11u IPv4 49721 0t0 TCP *:https (LISTEN)
nginx 3465 zimbra 11u IPv4 49721 0t0 TCP *:https (LISTEN)
nginx 3466 zimbra 11u IPv4 49721 0t0 TCP *:https (LISTEN)
nginx 3466 zimbra 20u IPv4 65269536 0t0 TCP mail.mydomain.com:https->22266622333.hkcable.com.hk:35505 (ESTABLISHED)
nginx 3467 zimbra 11u IPv4 49721 0t0 TCP *:https (LISTEN)
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zimbra@mail:~$ lsof -i :11211
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
memcached 3442 zimbra 26u IPv4 51334 0t0 TCP localhost:11211 (LISTEN)
memcached 3442 zimbra 27u IPv4 49769 0t0 TCP localhost:11211->localhost:40132 (ESTABLISHED)
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zimbra@mail:~$ netstat -tnpl | grep memcached
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 127.0.0.1:11211 0.0.0.0:* LISTEN 3442/memcached
Anybody have any ideas what's wrong?