# Email and SSH failing on one of my two networks but not the other

**URL:** <https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984>\
**Category:** uncategorized\
**Created:** [September 25, 2025, 9:03am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984 "2025-09-25T09:03:58Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Keith\_Rettig](https://discourse.mailinabox.email/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@Keith\_Rettig](https://discourse.mailinabox.email/u/Keith_Rettig)\
**Post date:** [September 25, 2025, 9:03am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/1 "2025-09-25T09:03:58Z")

</div>

I suddenly can’t check email nor SSH into one of my two MIAB servers from my business network (at my home) but I can check from my residential network. I can still check the other MIAB server from my business network.  
So that would seem to indicate the issue is on the MIAB server I can’t reach; correct?  
Suggestions of where to look for a root cause?

Thanks,  
Keith.

---

<div class="post-metadata">

**Author:** ![KiekerJan](https://discourse.mailinabox.email/user_avatar/discourse.mailinabox.email/kiekerjan/32/2339_2.png) [@KiekerJan](https://discourse.mailinabox.email/u/KiekerJan)\
**Post date:** [September 25, 2025, 9:09am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/2 "2025-09-25T09:09:58Z")

</div>

Check fail2ban on the miab box, perhaps your business network is blocked. Could also be a firewall or router issue on your business network.

---

<div class="post-metadata">

**Author:** ![Keith\_Rettig](https://discourse.mailinabox.email/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@Keith\_Rettig](https://discourse.mailinabox.email/u/Keith_Rettig)\
**Post date:** [September 25, 2025, 9:11am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/3 "2025-09-25T09:11:54Z")

</div>

Totally willing for it to be a problem with my firewall at home but what could it be? I use pfSense. I can do everything else I have always been able to do through said firewall. This just seems like a weird thing to suddenly happen.

---

<div class="post-metadata">

**Author:** ![Keith\_Rettig](https://discourse.mailinabox.email/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@Keith\_Rettig](https://discourse.mailinabox.email/u/Keith_Rettig)\
**Post date:** [September 25, 2025, 9:19am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/4 "2025-09-25T09:19:41Z")

</div>

No files updated in fail2ban directory this year. I don’t see any files updated in any of the sub-directories either.

---

<div class="post-metadata">

**Author:** ![Keith\_Rettig](https://discourse.mailinabox.email/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@Keith\_Rettig](https://discourse.mailinabox.email/u/Keith_Rettig)\
**Post date:** [September 25, 2025, 9:26am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/5 "2025-09-25T09:26:56Z")

</div>

From the firewall I can ping with the IPv6 address but not IPv4. From my computer, I can’t ping either.  
And now it doesn’t work from either.

---

<div class="post-metadata">

**Author:** ![Keith\_Rettig](https://discourse.mailinabox.email/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@Keith\_Rettig](https://discourse.mailinabox.email/u/Keith_Rettig)\
**Post date:** [September 25, 2025, 10:38am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/6 "2025-09-25T10:38:59Z")

</div>

sudo fail2ban-client unban \<myIPaddress(es)\>  
yields the same response of “0”; which I assume means that none of the lists had those IP addresses listed.

---

<div class="post-metadata">

**Author:** ![Keith\_Rettig](https://discourse.mailinabox.email/letter_avatar_proxy/v4/letter/k/3bc359/32.png) [@Keith\_Rettig](https://discourse.mailinabox.email/u/Keith_Rettig)\
**Post date:** [September 26, 2025, 8:23am UTC](https://discourse.mailinabox.email/t/email-and-ssh-failing-on-one-of-my-two-networks-but-not-the-other/15984/7 "2025-09-26T08:23:52Z")

</div>

I decided to go drastic and just delete the fail2ban database.  
It worked.  
Thanks for the lead @KiekerJan I also added my home IP address block to the jail.conf file to be ignored.