Avamar v5 SP1 bug: “Unable to connect to a login server.”

April 15, 2010


I recently experienced an issue trying to log into Avamar Administrator after upgrading our lab Avamar from version 5 to version 5 service pack 1.  After upgrading the Avamar Administrator to, I was hit with the following error:

“com.avamar.asn.NetworkException: Unable to connect to a login server.”

Avamar 5.0.1 Error

After doing some research, the following work around was provided:


Bug : http://bugs.avamar.com/show_bug.cgi?id=18726

The hostname of the utility node in /etc/hosts on the utility node does not match (upper / lower case) that of the FQDN defined in DNS


Install the hot fix available here :


Full instruction for installation available here: 


The hot fix includes a patch for the server and the console client GUI. 

This means installing a client patch on each computer where the console is installed, if this is not acceptable, please follow the workaround below.

A fixed console install program will not be available until the release of Avamar 5.0 SP2.


Match the case on the hostname in all of the following files:

1) DNS

2) /etc/hosts

3) /etc/sysconfig/network

4) /usr/local/avamar/var/mc/server_data/prefs/mcserver.xml

5) /usr/local/avamar/lib/mcserver.xml

Restart the MCS after changing the above files


One comment

  1. I’m currently working with EMC to POC Avamar and haven’t finished the POC. Due to some project timeline issues, I’m on a hold. I came across this error on our target node since this was the node that was first upgraded to version 5. I have applied the above chang

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