When I try and publish my additions on racks and tags I get the following message box "Errors , Tasks Racks and Tags, Status 502 invalid or missing command"

Under Session Log I get the following

"ags.com
>| Content-Length: 556
>| Connection: Keep-Alive
>| Cache-Control: no-cache
>|
>| <Envelope>
>| <Request>
>| <Command>sync</Command>
>| <Params>
>| <Param><Name>user</Name><Value>Wurzel</Value></Param>
>| <Param><Name>password</Name><Value>********</Value></Param>
>| <Param><Name>appname</Name><Value>orangecd</Value></Param>
>| <Param><Name>appversion</Name><Value>6.5.7.21902</Value></Param>
>| <Param><Name>appkey</Name><Value>e895a5297aad60f4486028e756eeea89</Value></Param>
>| <Param><Name>dbkey</Name><Value>89E99F5C83A12E2F</Value></Param>
>| <Param><Name>protocol</Name><Value>1</Value></Param>
>| </Params>
>| </Request>
>| </Envelope>
>|

<| HTTP/1.1 200 OK
<| Date: Tue, 06 Jun 2017 18:37:33 GMT
<| Server: Apache/2.2.15 (CentOS)
<| X-Powered-By: PHP/5.6.30
<| Cache-control: no-cache
<| Content-Length: 161
<| Keep-Alive: timeout=15, max=100
<| Connection: Keep-Alive
<| Content-Type: text/xml; charset=UTF-8
<|
<| <?xml version="1.0" encoding="UTF-8" ?>
<| <Envelope>
<| <Error>
<| <Code>502</Code>
<| <Description>502 Invalid or missing command</Description>
<| </Error>
<| </Envelope>


Any Ideas?