topic Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2 in Network Security

503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

CJ Bird — Tue, 29 Oct 2024 13:11:20 GMT

We currently run an FMC environment that manages a pair of Firepower 2100 FTD appliances. WE recently upgraded the FMC to Version 7.4.2.1 from 7.4.2, and we were planning to do the same for the FTD, which are also running 7.4.2. However, now that the FMC has been upgraded, when you navigate in FMC to 'device management', select the firewall to upgrade, regardless if you choose 'reset' or 'merge devices', I receive a general '503 Error - Resource Unavailable' message, which wasn't the case before we upgraded to 7.4.2.1. IS this a know a bug? Is there a known workaround. I scoured the web and could not find this error associated with this software version. Any direction is appreciated.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

balaji.bandi — Tue, 29 Oct 2024 13:23:18 GMT

i would check command show managers and see both still in contact and connected.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

CJ Bird — Tue, 29 Oct 2024 13:42:24 GMT

I checked both firewalls via CLI, and what the command yielded appears to be correct.

Type : Manager
Host : 10.x.x.x (redacted)
Display name : 10.x.x.x (redacted)
Version : 7.4.2.1 (Build 30)
Identifier : 36696960-367c-11e7-8740-ad2e2725d754
Registration : Completed
Management type : Configuration and analytics

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

balaji.bandi — Tue, 29 Oct 2024 15:02:40 GMT

if this is checked from FTD they are updated versio ?

Version : 7.4.2.1 (Build 30)

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

CJ Bird — Tue, 29 Oct 2024 15:09:18 GMT

7.4.2.1 (build 30) is what was upgraded on the FMC, as seen from the perspective of both FTD's via CLI, currently running 7.4.2. I cannot upgrade either FTD from FMC without running into the 503 error stated. Thanks.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

balaji.bandi — Tue, 29 Oct 2024 15:19:14 GMT

is the output show manager show old version and connected ? have you checked the logs in FTD any logs that indicated wrong ?

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

CJ Bird — Tue, 29 Oct 2024 16:18:14 GMT

Checked the logs and nothing noteworthy was observed. Any specific errors or anomalies I should be taking into account?

Yes, when I'm in the FTD (the 2110 series Firepower appliance), it reflects this:

Version : 7.4.2.1 (Build 30) - this is the new version running on the FMC, so it is reflecting the correct version.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

CJ Bird — Tue, 29 Oct 2024 18:16:23 GMT

This was actually not an accepted solution....didn't work. Any other suggestions?

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

balaji.bandi — Tue, 29 Oct 2024 18:33:59 GMT

ok is this HA or stand alone, if you get chance reboot the FTD and test again,- may be worth Open a TAC case also to troubleshoot if not seen any obnormal logs

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

Cristian Matei — Tue, 29 Oct 2024 18:55:00 GMT

Hi,

Can you try using a different browser and/or commit a change to FTD and see if it works afterwards?

Best,

Cristian.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

M1key — Wed, 30 Oct 2024 06:18:59 GMT

Any updates on this issue?

I have 2100 series on 7.2.7 that need to be updated to 7.4.2 just to get to 7.4.2.1 30 build.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

balaji.bandi — Wed, 30 Oct 2024 08:11:12 GMT

The OP post have different issue than yours, can you try upgrade using FMC or FTD following upgrade guide lines reading the release notes, what is the issue ?

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

CJ Bird — Wed, 30 Oct 2024 13:24:05 GMT

Well, imagine that - worked fine in Chrome, but received the 503 error only in Edge. So, we received last-minute change approval to update the FTD's from 7.4.2 to 7.4.2.1. which the FMC was running. Once the 7.4.2.1 was the only consistent version running, the issue resolved itself. Strange, as the IOS versions on our FTD's and FMC were previously not consistent, and we never ran into this issue. I guess from this point forward I'll mandate that all IOS versions match in both FTD and FMC environments. Thanks again.

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

cgn_ops_noc — Wed, 30 Oct 2024 16:10:49 GMT

WTF is going on?

The upgrade page is not working in Chrome but working in Safari.

What kind of lottery is it?

Re: 503 Error after upgrading FMC to 7.4.2.1 from 7.4.2

jrharmdx — Fri, 16 May 2025 21:04:28 GMT

We upgraded FMC and had the same issue where Settings>>ProductUpgrades displayed a 503 error (using chrome)

I was able to review upgrades in edge browser. My solution: delete cookies and close chrome completely, reopen and sign into the FMC.