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Okay... it's all my fault... the hangs issue resolved... lol when i setting RouteOS firewall filter, i set a rule to drop all forward invalid connection-state, this is what causes all the problems... thank you all for help :D I'm not very familiar with the principles of this part, if...

okay... today it's happen again :eek: when i login the server, i'm try use nslookup to another server in same subnet it's just hangs then response connection time out; no servers could be reached... oh my god ... i'm using ubuntu 18.04, use nmcli device show ens18, got.. nmcli device show...

wow, thank you very much when i change all sshd_config using UseDNS=no The abnormal connection does not seem to appear again let me test few days... i'm using Mikrotik Router as DNS server maybe it's reason...

Hi, Dear all.. i have a host installed 6.2-4, using 10G network card, everything look good, but when i use ssh connect to host or guest vm, i'm always get hangs on first time, then get message packet_write_wait: Connection to 10.0.0.1 port 22: Broken pipe rare thing is after this, the ssh...