sshd-core/src/main/java/org/apache/sshd/common/helpers/AbstractFactoryManager.java [457:472]:
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    public void removePortForwardingEventListener(PortForwardingEventListener listener) {
        if (listener == null) {
            return;
        }

        PortForwardingEventListener.validateListener(listener);
        if (this.tunnelListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] not registered", this, listener);
            }
        }
    }
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sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractSession.java [2334:2349]:
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    public void removePortForwardingEventListener(PortForwardingEventListener listener) {
        if (listener == null) {
            return;
        }

        PortForwardingEventListener.validateListener(listener);
        if (this.tunnelListeners.remove(listener)) {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] removed", this, listener);
            }
        } else {
            if (log.isTraceEnabled()) {
                log.trace("removePortForwardingEventListener({})[{}] not registered", this, listener);
            }
        }
    }
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