Bug ID 921625: The certs extend function does not work for GTM/DNS sync group

Last Modified: May 29, 2024

Affected Product(s):
BIG-IP GTM(all modules)

Known Affected Versions:
11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 16.0.0,, 16.0.1

Fixed In:
16.1.0,, 15.1.3, 14.1.4,

Opened: Jun 28, 2020

Severity: 3-Major


When GTM/DNS systems in the same sync group receive the error 'SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca', these systems cannot automatically connect to BIG-IP devices with which that GTM/DNS device has not already exchanged a SSL cert. As part of normal functionality, when one GTM/DNS tries to connect to a BIG-IP server and receives 'unknown ca' SSL error, if its peer GTM/DNS has already built a connection with that BIG-IP server, then the second GTM/DNS system should also be able to connect to that BIG-IP server automatically. But it cannot because of this issue. The problem exists only when the GTM/DNS device has not exchanged a cert with the BIG-IP server object, and there are two or more certs in /config/httpd/conf/ssl.crt/server.crt on that GTM/DNS device. You might see messages similar to the following: -- iqmgmt_ssl_connect: SSL error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca. -- err gtmd[28112]: 011ae0fa:3: iqmgmt_ssl_connect: SSL error: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca (336151576). -- notice gtmd[28112]: 011ae03d:5: Probe to buffer = <direct><![CDATA[<clientcert><ip></ip><target_ip></target_ip><cert>....


Certain GTM/DNS systems in the sync group cannot automatically connect to BIG-IP devices as expected. You must run additional bigip_add commands on those GTM/DNS systems in the GTM/DNS sync group to add the BIG-IP server.


-- /config/httpd/conf/ssl.crt/server.crt file with two or more certs on the requesting GTM/DNS device, which results in that file being larger than 4000 bytes. -- Configuration is as follows: 1. GTMDNS1 and GTMDNS2 are in a same GTM/DNS sync group. 2. GTMDNS1 has a self-authorized CA cert. 3. You add a BIG-IP server that is reachable but with which GTMDNS1 has not exchanged SSL certs.


Run bigip_add on each GTM/DNS server to add the configured BIG-IP servers.

Fix Information


Behavior Change

Guides & references

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