https://community.dynatrace.com/t5/Troubleshooting/Private-Synthetic-Location-Not-Available-for-TCP-NAM-Monitors/ta-p/300882 <H2>Summary</H2> <P>This article focuses on Dynatrace Synthetic Monitoring, specifically <STRONG>Network Availability Monitors (NAM) using TCP</STRONG>, and explains why a private Synthetic location may not be selectable when creating TCP monitors.</P> <P>It helps you understand the platform prerequisites and system‑level dependencies that determine whether <STRONG>TCP monitoring is available from a private location</STRONG>, and how to validate TCP connectivity using ActiveGate diagnostics and host-level testing.</P> <P>&nbsp;</P> <P><LI-TOC indent="15" liststyle="disc" maxheadinglevel="3"></LI-TOC></P> <DIV> <P>&nbsp;</P> <H2>Problem</H2> <P>After deploying <STRONG>Synthetic‑enabled ActiveGates</STRONG> and assigning them to a new private Synthetic location, the location appears as <STRONG>Not supported</STRONG> when attempting to create a TCP Network Availability Monitor.</P> <H3>In the Dynatrace UI</H3> <P>You may observe one or more of the following:</P> <UL> <LI>In <STRONG>Synthetic → Private locations</STRONG>, the private location shows a <STRONG>Compatibility health alert</STRONG></LI> <LI><STRONG>Network Availability (TCP)</STRONG> is missing from the available monitor types under:<BR /><EM>Classic Settings → Web and mobile monitoring → Private Synthetic locations → Edit location</EM></LI> <LI>The private location is marked as <STRONG>Not supported</STRONG>, with a message indicating that the location is not configured to execute this type of monitor</LI> </UL> <P>&nbsp;</P> <H2>Evidence in ActiveGate logs</H2> <P>The ActiveGate diagnostic logs (<CODE>vuc-status.log</CODE>) indicate that TCP capability is unavailable, even though other protocols may still be operational.</P> <P>Example:</P> <PRE><CODE>MULTIPROTOCOL = { MULTIPROTOCOL_TCP = DiagnosticCaseDetail[isAvailable=false], MULTIPROTOCOL_DNS = DiagnosticCaseDetail[isAvailable=true], MULTIPROTOCOL_ICMP = DiagnosticCaseDetail[isAvailable=true] } </CODE></PRE> <P>When <CODE>MULTIPROTOCOL_TCP</CODE> is reported as <CODE>isAvailable=false</CODE>,<BR /><STRONG>TCP NAM monitors are automatically disabled for the private location</STRONG>.</P> <P>This behavior is consistent with how Dynatrace enables NAM monitor types only when the required protocol capability is validated on the ActiveGate host.</P> <P><SPAN>For information on finding the log see&nbsp;</SPAN><A id="link_6" class="page-link lia-link-navigation lia-custom-event" href="https://community.dynatrace.com/t5/Troubleshooting/Useful-Synthetic-ActiveGate-logs/ta-p/214478" target="_blank">Useful Synthetic ActiveGate logs</A></P> <P>&nbsp;</P> <H2>Troubleshooting steps</H2> <P>Use the following steps to determine whether the limitation is due to Dynatrace configuration or host/network constraints.</P> <H3>1. Review ActiveGate diagnostic results</H3> <UL> <LI>Check <CODE>vuc-status.log</CODE> for multi-protocol diagnostics</LI> <LI>Confirm whether: <PRE><CODE>MULTIPROTOCOL_TCP = isAvailable=false </CODE></PRE> </LI> <LI>If false, the issue originates from the ActiveGate environment rather than Dynatrace configuration</LI> </UL> <P>&nbsp;</P> <H3>2. Understand how TCP availability is validated</H3> <P>A TCP NAM monitor works by <STRONG>establishing a TCP connection to a specific port on a target host.</STRONG></P> <P>The ActiveGate must be able to:</P> <UL> <LI>Open an outbound TCP connection</LI> <LI>Reach the target host over the network</LI> <LI>Successfully complete a TCP handshake on the specified port</LI> </UL> <P>If this fails during diagnostics, TCP monitoring will be disabled.</P> <P>&nbsp;</P> <H3>3. Verify TCP connectivity from the ActiveGate host</H3> <P>Run connectivity tests directly from the ActiveGate host to the target endpoint.</P> <P>Examples:</P> <DIV class="___77lcry0 f10pi13n"> <DIV class="___1hewfwb f10pi13n f7oukh6 f5p0z4x" tabindex="0" role="group" aria-label="Code Preview"> <DIV class="fui-FluentProvider codeBlock-2215fui-FluentProviderr0 ___1jk74h0 fzk5nv6 f6n0el9 f7x6x6c f1a9mlr7 flj889f f13g0yyb ffzn0d2" dir="ltr" data-testid="ComponentFluentProviderId"> <DIV class="scriptor-component-code-block NhtKn7PZLzk24rduw4FJVQ== scriptor-codeblock-virtualized" tabindex="-1"> <DIV class="CDXiecnD7ekDByb7Z+4oEA=="> <DIV class="r14iuplo fui-AriaLive__assertive" aria-live="assertive"><LI-CODE lang="markup">nc -vz &lt;hostname&gt; &lt;port&gt;</LI-CODE></DIV> <DIV class="r14iuplo fui-AriaLive__polite" aria-live="polite">or</DIV> <DIV class="r14iuplo fui-AriaLive__polite" aria-live="polite"><LI-CODE lang="markup">telnet &lt;hostname&gt; &lt;port&gt;</LI-CODE></DIV> </DIV> </DIV> </DIV> </DIV> </DIV> <DIV class="___77lcry0 f10pi13n"> <DIV class="___1hewfwb f10pi13n f7oukh6 f5p0z4x" tabindex="0" role="group" aria-label="Code Preview"> <DIV class="fui-FluentProvider codeBlock-1659fui-FluentProviderrg ___1jk74h0 fzk5nv6 f6n0el9 f7x6x6c f1a9mlr7 flj889f f13g0yyb ffzn0d2" dir="ltr" data-testid="ComponentFluentProviderId"> <DIV class="scriptor-component-code-block NhtKn7PZLzk24rduw4FJVQ== scriptor-codeblock-virtualized" tabindex="-1"> <DIV class="_47QlA7XYWbfK2INfVvTUjg=="> <DIV class="iVmNpJv5Hu1Eu0ev0L3Ffg=="> <DIV class="KU8Z3uOm5OU11Ica53+OVA=="> <DIV class="fui-Overflow Ye6tJij6H1xMCTdS6F25rA== ___s5d2bt0 f3x039c facid5"> <DIV class="vCHKFE0-MqMN20DBXhx6Ow==">&nbsp;</DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> </DIV> <P>Expected outcome:</P> <UL> <LI>Successful connection → TCP should be available</LI> <LI>Connection refused / timeout → indicates network or service issue</LI> </UL> <P>&nbsp;</P> <H3>4. Check firewall and network restrictions</H3> <P>Ensure that:</P> <UL> <LI>Outbound traffic to the target port is <STRONG>allowed</STRONG></LI> <LI>Intermediate firewalls are not blocking TCP handshake traffic</LI> <LI>Network routing between ActiveGate and target is correctly configured</LI> </UL> <P>Common issues:</P> <UL> <LI>Denied outbound rules</LI> <LI>Missing return route</LI> <LI>Segmented networks without proper allowlisting</LI> </UL> <P>&nbsp;</P> <H3>5. Validate service availability on the target</H3> <P>Confirm that:</P> <UL> <LI>The target host is reachable</LI> <LI>The specified port is open and listening</LI> <LI>The service supports TCP connections</LI> </UL> <P>Example checks:</P> <DIV class="___77lcry0 f10pi13n"> <DIV class="___1hewfwb f10pi13n f7oukh6 f5p0z4x" tabindex="0" role="group" aria-label="Code Preview"> <DIV class="fui-FluentProvider codeBlock-148fui-FluentProviderrp ___1jk74h0 fzk5nv6 f6n0el9 f7x6x6c f1a9mlr7 flj889f f13g0yyb ffzn0d2" dir="ltr" data-testid="ComponentFluentProviderId"> <DIV class="scriptor-component-code-block NhtKn7PZLzk24rduw4FJVQ== scriptor-codeblock-virtualized" tabindex="-1"> <DIV class="CDXiecnD7ekDByb7Z+4oEA=="> <DIV class="r14iuplo fui-AriaLive__assertive" aria-live="assertive"><LI-CODE lang="markup">ss -tuln | grep &lt;port&gt;</LI-CODE></DIV> </DIV> <DIV class="scriptor-code-scroll-proxy"> <DIV>&nbsp;</DIV> </DIV> </DIV> </DIV> </DIV> </DIV> <P>If the service is not listening, the TCP diagnostic will fail.</P> <P>&nbsp;</P> <H2>Resolution</H2> <P>Once the issue is identified and resolved:</P> <UL> <LI>Ensure TCP connectivity from the ActiveGate host is successful</LI> <LI>Restart the ActiveGate service (if required to refresh diagnostics)</LI> <LI>Re-check <STRONG>Synthetic → Private locations</STRONG></LI> </UL> <P>Expected result:</P> <UL> <LI>The private location no longer shows compatibility errors</LI> <LI><STRONG>Network Availability (TCP)</STRONG> becomes selectable</LI> <LI>TCP NAM monitors can be created successfully</LI> </UL> <P>&nbsp;</P> <H2>After resolving the cause of the failure</H2> <UL> <LI>Re-run diagnostics via ActiveGate logs to confirm: <PRE><CODE>MULTIPROTOCOL_TCP = isAvailable=true </CODE></PRE> </LI> <LI>Trigger an <STRONG>on-demand execution</STRONG> to validate monitor success</LI> <LI>Confirm results in the Synthetic app</LI> </UL> <P>&nbsp;</P> <H2>What’s next</H2> <UL> <LI>Consider creating multiple TCP requests within a single NAM monitor to validate multiple endpoints efficiently</LI> <LI>Define appropriate thresholds for connection success or failure</LI> <LI>Combine TCP NAM monitoring with ICMP or DNS checks for deeper network visibility</LI> </UL> <P>&nbsp;</P> <H3>Related reading</H3> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp; <A class="fui-Link ___w5et180 f2hkw1w f3rmtva f1ewtqcl fyind8e f1k6fduh f1w7gpdv f1mo0ibp fjoy568 ff5ikls f1s184ao f1mk8lai fnbmjn9 f1o700av f13mvf36 f1cmlufx f9n3di6 f1ids18y f1tx3yz7 f1deo86v f1eh06m1 f1iescvh fhgqx19 f1olyrje f1p93eir f1nev41a" tabindex="0" href="https://docs.dynatrace.com/docs/observe/digital-experience/synthetic-monitoring/network-availability-monitors/create-a-nam-monitor" target="_blank" rel="noopener noreferrer" data-tabster="{&quot;restorer&quot;:{&quot;type&quot;:1}}">Create a NAM monitor (Dynatrace Docs)</A></P> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp; <A class="fui-Link ___w5et180 f2hkw1w f3rmtva f1ewtqcl fyind8e f1k6fduh f1w7gpdv f1mo0ibp fjoy568 ff5ikls f1s184ao f1mk8lai fnbmjn9 f1o700av f13mvf36 f1cmlufx f9n3di6 f1ids18y f1tx3yz7 f1deo86v f1eh06m1 f1iescvh fhgqx19 f1olyrje f1p93eir f1nev41a" tabindex="0" href="https://docs.dynatrace.com/docs/observe/digital-experience/synthetic-monitoring/network-availability-monitors/network-availability-monitoring" target="_blank" rel="noopener noreferrer" data-tabster="{&quot;restorer&quot;:{&quot;type&quot;:1}}">Network availability monitoring overview</A></P> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp; <A href="https://community.dynatrace.com/t5/Troubleshooting/Synthetic-Troubleshooting-Map/ta-p/250426" target="_self">Synthetic Monitoring Troubleshooting Map</A></P> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp; <A href="https://docs.dynatrace.com/docs/observe/digital-experience/synthetic-on-grail/synthetic-app/private-locations/manage-private-locations#health-status" target="_blank" rel="noopener noreferrer">Manage Private locations</A>&nbsp;&nbsp;</P> <P><span class="lia-unicode-emoji" title=":open_book:">📖</span>&nbsp; <A id="link_6" class="page-link lia-link-navigation lia-custom-event" href="https://community.dynatrace.com/t5/Troubleshooting/Useful-Synthetic-ActiveGate-logs/ta-p/214478" target="_blank">Useful Synthetic ActiveGate logs</A>&nbsp;&nbsp;</P> </DIV> Fri, 19 Jun 2026 12:00:38 GMT HannahM 2026-06-19T12:00:38Z https://community.dynatrace.com/t5/Troubleshooting/Private-Synthetic-Location-Not-Available-for-TCP-NAM-Monitors/ta-p/300882 <P><LI-TOC indent="15" liststyle="disc" maxheadinglevel="2"></LI-TOC></P> <DIV class="lia-message-template-content-zone"> <P>*<EM>Use a table of contents for longer articles.&nbsp;</EM></P> <H1>Summary</H1> <P><EM>*This is a mandatory section.</EM></P> <P><EM>Short description of which part of the Dynatrace platform the article refers to and what kind of problem it will help resolve / task it will describe.</EM></P> <P>&nbsp;</P> <H1>Problem</H1> <P><EM>*This is a mandatory section.</EM></P> <P><EM>Provide a precise description of the problem / task to be described.</EM></P> <P>&nbsp;</P> <H1>Troubleshooting steps</H1> <P><EM>*This section can be omitted.</EM></P> <P>&nbsp;</P> <H1>Resolution</H1> <P><EM>*This section can be omitted for ticket‑creation articles.</EM></P> <H1>What's next</H1> <P><EM>*This is a mandatory section.</EM></P> </DIV> Fri, 19 Jun 2026 12:00:38 GMT https://community.dynatrace.com/t5/Troubleshooting/Private-Synthetic-Location-Not-Available-for-TCP-NAM-Monitors/ta-p/300882 HannahM 2026-06-19T12:00:38Z