# Issue with java.net module import in Ignition V 8.1.5

**URL:** <https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [May 12, 2022, 9:51am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496 "2022-05-12T09:51:16Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Sanket](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@Sanket](https://forum.inductiveautomation.com/u/Sanket)\
**Post date:** [May 12, 2022, 9:51am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/1 "2022-05-12T09:51:16Z")

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Used Module “[java.net](http://java.net)” for InetAddress for pinging the IP address from the Ignition installed PC. Was working well for ignition version 8.0.16. But, after upgradation facing problem/error for new version 8.1.5.  
Tried both upgradation and fresh installation of the version 8.1.5

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**Author:** ![djs](https://avatars.discourse-cdn.com/v4/letter/d/e47774/32.png) [@djs](https://forum.inductiveautomation.com/u/djs)\
**Post date:** [May 12, 2022, 11:59am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/2 "2022-05-12T11:59:48Z")

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What is the error? Can you post a stack trace?

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**Author:** ![Sanket](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@Sanket](https://forum.inductiveautomation.com/u/Sanket)\
**Post date:** [May 13, 2022, 5:40am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/3 "2022-05-13T05:40:00Z")

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from [java.net](http://java.net) import InetAddress  
timeout = 5000  
device = InetAddress.getByName(address)  
ping = device.isReachable(timeout)  
if ping == 1:  
Print “Device Reachable”  
if ping == 0:  
print “Device is not Reachable”

As a Output of this script is “Device is not Reachable”. without any error means, its not able to ping the IP address which is connected.  
I read below doc and found some details related to the firewall and server configuration blocking.

 ![123](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/7/1732c7e9f26f2fc92efc2abaf6580267a2ecd137.png)  
URL -[InetAddress (Java Platform SE 8 )](https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html)

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [May 13, 2022, 8:12am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/4 "2022-05-13T08:12:33Z")

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If on Linux and not running as root, use of any ping-like raw packet requires the `CAP_NET_RAW` capability (privilege). You can specify that in the SystemD service file (or override) with the `AmbientCapabilities=CAP_NET_RAW` setting. You can specify multiple capabilities with whitespace. I recommend `AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_RAW`.

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**Author:** ![djs](https://avatars.discourse-cdn.com/v4/letter/d/e47774/32.png) [@djs](https://forum.inductiveautomation.com/u/djs)\
**Post date:** [May 13, 2022, 7:31pm UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/5 "2022-05-13T19:31:58Z")

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I run a script that is essentially the same and it works just fine, never broke with upgrades. (1.8.16)

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**Author:** ![Sanket](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@Sanket](https://forum.inductiveautomation.com/u/Sanket)\
**Post date:** [June 4, 2022, 7:45am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/6 "2022-06-04T07:45:41Z")

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Hello @djs,

Thanks for the updates. the problem was with firewall.  
No for me it is also working fine.

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<div class="post-metadata">

**Author:** ![Sanket](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@Sanket](https://forum.inductiveautomation.com/u/Sanket)\
**Post date:** [June 4, 2022, 7:46am UTC](https://forum.inductiveautomation.com/t/issue-with-java-net-module-import-in-ignition-v-8-1-5/59496/7 "2022-06-04T07:46:39Z")

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@pturmel, thank you for information.