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I am a newbie to dovecot but not postfix and centos I created a new VM with Centos 8 and installed dovecot and postfix.? Postfix is working fine but dovecot rejects connections from anything but the local machine. Locally ? Trying 10.10.100.157... ? Connected to 10.10.100.157. ? Escape character is '^]'. ? * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE

...the connect > packet arriving and the response packet was ICMP type 3 code 13. Which make it pretty clear that it has nothing to do with dovecot as such as that's aresponse from the TCP/IP-stack ... > Any ideas? Duckduckgo-ing "icmp 3 13" delivers as the 1st link http://www.networksorcery.com/enp/protocol/icmp/msg3.htm and 13 seem to indicate "Communication Administratively Prohibited." Your turn;-) MfG, Bernd -- Bernd Petrovitsch Email : bernd at petrovitsch.priv.at LUGA : http://www.luga.at

...arriving and the response packet was ICMP type 3 code 13. > Which make it pretty clear that it has nothing to do with > dovecot as such as that's aresponse from the TCP/IP-stack ... > >> Any ideas? > Duckduckgo-ing "icmp 3 13" delivers as the 1st link > http://www.networksorcery.com/enp/protocol/icmp/msg3.htm and > 13 seem to indicate "Communication Administratively Prohibited." > > Your turn;-) > > MfG, > Bernd CentOS 8 use nftables instead of iptables so first of all try firewall-cmd --list-services

Hello, while checking new mtu9k-setup, I discovered that ping has some odd behaviour. If I use payloadsize > 4067, every 2nd icmp-echo-request seems to be malformed: ping -s 4068 -D 10.5.49.65 1st: 12:21:09.048447 IP 10.5.49.126 > 10.5.49.65: ICMP echo request, id 46597, seq 0, length 4076 0x0000: 4500 1000 0f2d 4000 4001 a507 0a05 317e 2nd: 12:21:10.052891 IP 10.5.49.126 >