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I have a remote Ubuntu 16.04 server and try to ssh into it over VPN connection. From Windows Putty it works fine but from Ubuntu 16.04 Workstation terminal not! Debug show me this:

ssh -vvv -p 33333 karl@177.177.177.177
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "177.177.177.177" port 33333
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 177.177.177.177 [177.177.177.177] port 33333.
debug1: connect to address 192.168.1.100 port 33333: Connection refused
ssh: connect to host 192.168.1.100 port 33333: Connection refused

some Ideas what I can do?

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  • Check that you didn't introduce a conflicting firewall rule on the client or server. Last month, that 'block everything' rule might have seemed a great idea.
    – user535733
    Aug 27, 2019 at 16:05
  • But it do not block putty
    – fteinz
    Aug 27, 2019 at 16:06
  • Check outbound firewall rules (if any) on the client, too.
    – user535733
    Aug 27, 2019 at 16:09
  • Generally, check any rules and restrictions that may apply. I once configured a (local) server so only IPs from 192.168.0.* were allowed to connect. That was the IP range I used in my local net then. Years later, a new router / DHCP server assigned IPs from a different subnet, say 192.168.20.*. It took me a while to understand why I couldn't reach that server anymore ;) Aug 27, 2019 at 16:11
  • Hmm. sudo ufw allow 33333 do not the trick
    – fteinz
    Aug 27, 2019 at 16:21

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