Floating License error @ Linux client end

When I trying to invoke Quartus II 13.0 from my RHEL6.4 Client system, the following error is coming

Warning (292006): Can't contact license server "1800@SYNOPSYS" -- this server will be ignored.

client : rhel6.4

LM_LICENSE_FILE=1800@MY_SERVER

export LM_LICENSE_FILE

export PATH=${PATH}:/home/altera/13.0/quartus/bin

export PATH=${PATH}:/home/altera/13.0/modelsim_ae/bin

server : rhel 6.4

LM_LICENSE_FILE=1800@MY_SERVER

export LM_LICENSE_FILE

export PATH=${PATH}:/home/altera/13.0/quartus/bin

export PATH=${PATH}:/home/altera/13.0/modelsim_ae/bin

SERVER license.dat

SERVER MY_SERVER 00144F0FA54E 1800

VENDOR alterad /home/altera/13.0/quartus/linux/alterad PORT=1801

VENDOR mgcld /home/altera/13.0/modelsim_ae/linuxaloem/mgls/lib/mgcld PORT=1802

USE_SERVER

Note: In the same server synopsys tcad tools are running with

SNPSLMD_LICENSE_FILE=27020@SYNOPSYS