- Open source alternative to teamsid install#
- Open source alternative to teamsid verification#
- Open source alternative to teamsid free#
Some of these servers were quite old (One is over 5 years old, so forcing it's management into Puppet when it has lots of customisation and idiosynchrocies was a little nerve-wracking. Over the weekend I finished migrating all my servers to being managed by a PuppetMaster.
Open source alternative to teamsid verification#
The hostname part of his email address was a subdomain which had no DNS record so sender verification failed. Oh, and in case you were wondering, the cause of the mail getting through was misconfiguration of the sender's DNS. Alternatively, change the MX records for all domains your server handles mail for, to a hostname which is included on the certificate. I use letsencrypt so I just regenerated a certificate and added -d .uk switch. So we can see why this error is occuring, the easy fix is to ensure that the certificate used by Exim has all required hostnames.
I then ran the same command but using a hostname I knew was on the certificateĢ20 .uk ESMTP Exim 4.84_2 Sat, 00:02:08 +0100Ģ.uk Hello .uk *** Fatal error: Error in the certificate. *** PKI verification of server certificate failed. The name in the certificate does not match the expected. Status: The certificate is NOT trusted. subject `C=US,O=Let's Encrypt,CN=Let's Encrypt Authority X3', issuer `O=Digital Signature Trust Co.,CN=DST Root CA X3', RSA key 2048 bits, signed using RSA-SHA256, activated ` 16:40:46 UTC', expires ` 16:40:46 UTC', SHA-1 fingerprint `e6a3b45b062d509b3382282d196efe97d5956ccb' Got a certificate list of 2 certificates. Then connect using gnutls-cli bold red text is what I typed and bold blue text is the useful part of the responseĢ20 .uk ESMTP Exim 4.84_2 Fri, 20:40:55 +0100Ģ.uk Hello localhost As exim is compiled against gnutls we'll need to use the gnutls command line tools. To diagnose the issue, lets try connecting on a hostname that is not on the certificate, as I was on the server, 127.0.0.1 would do fine. My certificate had .uk and however my MX records are .uk, this doesn't really cause an error, mail is still accepted, however at some point in future (and some very strict mail servers) may refuse such connections so it's best to get it fixed. " 20:20:36 TLS error on connection from servername (servername) (gnutls_handshake): A TLS fatal alert has been received.Īnything producing the words 'fatal' in logs are cause for alarm and it wasn't something I'd seen before so I did a bit of investigation and found that it was due to the TLS certificate I have for exim not having a common name set that matches the hostname that the remote server was connecting to. Whilst diagnosing why an email wasn't getting through to me, I noticed the following errors appearing occasionally in my Exim logs.
Open source alternative to teamsid free#
If you found this useful, please feel free to donate via bitcoin to 1NT2ErDzLDBPB8CDLk6j1qUdT6FmxkMmNzĮxim and gnutls - A TLS fatal alert has been received
Open source alternative to teamsid install#
The downside of Mattermost is the management of the stack on your infrastructure, backups, updates etc but if you have an existing IT team, this should be a very minimal workload addition for the security and peace of mind that all your shared files/conversations are all stored in-house.įor testing they also provide an easy to install docker image, well worth a test. The interface is heavily influenced by Slack and everything is where you'd expect and includes apps for all major OSes including Linux.
It has a free cut-down version and further more advanced versions for a fee, however the basic slack functionality you're used to is all available in the free version. Although it uses TLS to stop snoopers betweeon your client and Slack itself, having Slack hold on to all your conversations is a worrying proposal for a business.Įnter Mattermost, an open source alternative to Slack that you install into your own infrastructure. Slack is often used to transfer files with business data and transmit data passwords (a practice I'm very much against). Slack has been gaining a lot of traction for collaboration in the IT world over the last few years and it's quite a good tool but the "Cloud" aspect of it and the potential lack of privacy that comes with it is a big concern.
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