am a new user of mikrotik router. i just started a wireless network do am in the test stage but there is a problem i have noticed which i odnt understand why it happens. When i want connect with some clients it doesnt connect.when i check the log it says LOST EXCESSIVE DATA RETRIES.
what can i do to correct this.

What version of RouterOS do you use? If V.2.9 and your hardware is i386's clone based then try to downgrade to V.2.8.28. I had the same problem when upgrade to V.2.9. Now I still use V.2.8 just I can't fully test new version on my working system.

the version is v2.8.28. so thats why i am wondering because when i went through the forum i saw that it was 2.9 that had the problem i am having. what else could be the cause -- frequency, bandwidth,signal strength, particular type of data. please i need help for real.

How far are your clients from the AP? Do they have a good noise to signal strength ratio?