Citrix XenApp 6.5 COM Port Redirection Not Mapping

One out of five Citrix XenApp 6.5 servers is not allow clients to redirect/map their local COM4 to the Server COM1. We use a Net Use command at login to map a USB-to-serial signature pad that lives on client COM4.

The other 4 Citrix XenApp servers are properly redirecting/mapping the COM ports fine.

I checked the RDM Session Host Config. console and the ICA and RDP allow COM redirection...

Server: Windows 2008 R2
Citrix: XenApp 6.5
Client: XenApp Hosted Full 12.3
Freda Driscoll-SbarDirector of System OperationsAsked:
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Freda Driscoll-SbarConnect With a Mentor Director of System OperationsAuthor Commented:
All servers same config and patch levels. This problem appeared to have resolved itself.
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Ayman BakrSenior ConsultantCommented:
1. First of all check whether that XenApp 6.5 server is at the same patch and hotfix level and same rollup pack level as the others.

2. Connect to a desktop session on that server, open a CMD session and try to manually map the COM port using net use command and check if it is successful.

3. Is the server included in the same Workgroup, OU and Windows security groups as the other XenApp servers - that is to say, is it getting the same set of policies as the others?
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Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
Mutawadi, Thanks for the insight;

1. Citrix version/patch levels are same
2. We are testing RDP COM mapping outside of Citrix next...
3. Yes, same domain and same GPO's for all 5 servers.
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Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
I just confirmed that syslog messages are populating the Syslog db table 'syslog_incoming', BUT not showing in the Cacti...

Any ideas?
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Ayman BakrSenior ConsultantCommented:
Check the installation, configuration and patch level of your application. Is it the same on all servers?
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Freda Driscoll-SbarDirector of System OperationsAuthor Commented:
issue resolved itself.
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