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What do these ALG setting on my router mean, and what is ALG? 12 "ALG" here stands for "Application-layer Gateway" That is, firewall modules which cope with some peculiarities of those protocols On a stateful firewall, the "state" is usually tied to just addresses and port numbers That is, you send a packet from port X to server's port Y, and the firewall automatically allows the reverse back in
How do I change the allowed host key algorithms for SSH? @Ramhound I do not know where to set the verbose logging option, but I used verbose logging while connecting to the server from the command line (see edited question) What is interesting there is the line: Skipping ssh-dss key root ssh id_dsa - not in PubkeyAcceptedKeyTypes This variable sounds like what I am looking for, but it is not defined within the sshd_config
Why SIP-ALG in routers and modems? - Super User Without SIP-ALG you may have one-way audio on VoIP conversations (see below) Unfortunately the SIP-ALG in many routers is poorly implemented and causes more problems than it solves If you have one of these problem routers it is recommended that the SIP-ALG is disabled and other methods used to ensure VoIP works correctly
networking - Can’t Access Port-Forwarded Services on Frontier Arris . . . Disabled UPnP, ALG, etc Verified NAT is Disabled DMZ is Disabled (haven’t tried enabling it yet) Device Configuration: NUC has SSH running and accessible internally on 192 168 254 39:XX22 No software firewall (no ufw, iptables rules blocking) Verified: NUC responds to internal SSH and web traffic WAN IP is publicly pingable, not behind CGNAT
Port 21 is open but I cant connect to FTP server - Super User It's rare to find a NAT gateway with FTP ALG code to allow a server behind the NAT to be reached via Passive FTP, but it's somewhat less rare to find a NAT gateway with ALG code to allow an inside client to reach an outside server via Active FTP Most modern FTP clients default to Passive FTP
FTP passive server setup works when it shouldnt work The ALG mode: the server ignores passive port settings, if any, and generates a random port on its own on every PASSV command from client The router automatically opens this port