BugZero | F5 BugID 1289549 - TCP RST internal error in tcpproxy bad transition ...

F5 - Defect ID: 1289549

TCP RST internal error in tcpproxy bad transition during SSL connection closure.

F5 - Defect ID: 1289549

TCP RST internal error in tcpproxy bad transition during SSL connection closure.

Last updated on July 18th, 2026

BugZero Risk Score
6.2 Medium

Overall: 6.2

Severity: 6.4

Community: 4.2

Lifecycle: 10.0

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Bug Details

Priority: 4-Minor
Status: Resolved
Impact Category: Local Traffic Manager

Description

Symptoms

The BIG-IP RSTs connection with Internal error in tcpproxy bad transition.

Impact

Connection closes abruptly on serverside.

Conditions

Issue occurs when following condition is met: Client - DUT1 - DUT2 - Server -> Configure https virtual server on both DUT1 and DUT2 -Configure client-ssl profile with 'maximum-record-size' set to 256 and unclean-shutdown to disabled - Configure tcp profile with nagle enabled -> On DUT1 configure a default https in-tmm monitor monitoring a DUT2. -> On Server, make sure the response spans 3 to 4 times the SSL record size.

Workaround

None

Fix Information

Connection closes as expected.

Change history

Links

Original Vendor Announcement

Relevant Products

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Affected versions:14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 14.1.5.3, 14.1.5.4, 14.1.5.6, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1

Fixed versions: 15.1.10

Relevant Products

Click on a version to see all relevant bugs

Fixed versions: 15.1.10

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F5 - Defect ID: 1289549

TCP RST internal error in tcpproxy bad transition during SSL connection closure.

F5 - Defect ID: 1289549

TCP RST internal error in tcpproxy bad transition during SSL connection closure.

Last updated on July 18th, 2026

BugZero Risk Score6.2 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

F5 - Defect ID: 1289549

TCP RST internal error in tcpproxy bad transition during SSL connection closure.

F5 - Defect ID: 1289549

TCP RST internal error in tcpproxy bad transition during SSL connection closure.

Last updated on July 18th, 2026

BugZero Risk Score6.2 Medium

Bug Details

Symptoms

Impact

Conditions

Workaround

Fix Information

Links

Top F5 Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
6.2 Medium

BugZero Risk Score
6.2 Medium