Unable to connect to Webmin web interface any more

eeyo
eeyo used Ask the Experts™
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I set up a headless unbuntu server (10.0) a while ago, along with webmin (v.1.530).  Haven't need to access the server via webmin for a while, but can't seem to connect remotely.  I can ping the server by name and IP. but when I try to access Webmin via https://servername:10000 (with http and https), IE and Firefox just timeout trying to connect. (I have also tried via IP address as well).  Rebooting the router, rebooting the server, restarting webmin (when I telnet via Putty) doesn't allow me to access webmin.  I have verified that the standard port 10000 is correct in the configuration file.  I have also turned off firewalls on 2 separate remote computers, but no luck connecting.

I tried the command:
nc -zvw 3 <xxx.xxx.xxx.xxx> 10000

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in the terminal and got this as a response:¨
Connection to xxx.xxx.xxx.xxx 10000 port [tcp/webmin] succeeded!

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Any idea of why I can't connect?
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Commented:
For other users' benefit, here is what I figured out.  While telnetting into the server, I had to turn off the server's firewall (mine was too tight).  It ended up being that webmin's SSL certificate had expired.  To renew it, go to Webmin > Webmin Configuration > SSL Encryption, Create Certificate tab.  Make sure the RSA key size is at least 2048.

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